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8 Workouts that improve endurance and fat burning

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8 Workouts that improve endurance and fat burning

There’s a pervasive mentality in the fitness world that the best workouts leave you soaked in sweat and gasping for air. Popular phrases like “no pain, no gain” and “sore today, strong tomorrow” embody this pedal-to-the-metal mindset.

While there are legit benefits to exercising at or near maximum effort, “you don’t have to work at a 10 out of 10, or have it be the hardest workout of your life, for it to actually be beneficial,” Peloton instructor Rebecca Kennedy tells SELF. In fact, there are tons of unique gains you can score when you incorporate more low-to-moderate-intensity training into your routine. That’s what zone 2 cardio is all about.

Here’s everything you need to know about zone 2 cardio, including its amazing benefits and easy ways to weave it into your schedule. Plus, eight workout examples that fit the bill for zone 2, giving you ample options to experience the underrated awesomeness yourself.

What zone 2 cardio actually is

Simply put, zone 2 cardio is any form of movement that has you working at a low-to-moderate intensity for a sustained period of time, Grace Horan, MS, ACSM-EP, an exercise physiologist at Hospital for Special Surgery in New York City, tells SELF.

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Zone 2 cardio is not about speed, power, or max strength but instead centers on slow, steady efforts performed over the long haul. Basically, it’s endurance training, Horan says.

Traditionally, zone 2 is defined as exercise that keeps your heart rate between 60% to 70% of its maximum level, but this is a generalization; for some people, zone 2 can happen at different percentages of max heart rate, Horan says. It’s better to think of it in terms of how intense exercise feels and how much it impacts your breathing. As Kennedy puts it: “If you can get on a phone call and have a conversation without having to stop and catch your breath, you’re likely in zone 2.”

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Benefits of zone 2 cardio

Incorporating zone 2 cardio into your routine will deliver a host of health and fitness benefits. For starters, it helps your cardiovascular system run more efficiently. That’s in part because zone 2 training increases the size and density of mitochondria in your muscle cells, Horan says.

As you might remember from middle school biology, mitochondria are the “powerhouse” part of your cells that produce energy to fuel your movements. Beefing them up will help your body complete both workouts and tasks of daily living (like climbing the stairs and walking your dog) with less stress to your heart, lungs, and muscles, Horan says. Overall, people with larger and more dense mitochondria are more likely to have better cardiovascular fitness and metabolic health, she adds.

Zone 2 training also helps improve your body’s ability to burn fat (in addition to its go-to quick energy source, carbs) as fuel. This allows you to keep exercising for longer. “It’s really going to help build out your endurance and your aerobic base so you can do things for the long haul,” Horan says. That’s why zone 2 training is a core component of marathon training programs.

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At the same time, frequently training with zone 2 cardio can also benefit you during higher-intensity exercise, like weightlifting or HIIT workouts. Specifically, you may notice that your heart rate comes back down quicker when you’re resting in between sets, Kennedy says. This translates to more efficient recovery intervals, allowing you to push harder again when it’s time to eke out the next round of reps.

How to know if a workout qualifies as zone 2

Many fitness wearables—like the Apple Watch, for example—use heart rate data to classify which zone(s) your workout falls into. And while these devices do a “relatively good job” at determining the zone, they’re based off a mathematical equation that’s not wholly accurate, Horan says. (The most precise way to measure your maximum heart rate is through a blood lactate test, which, obviously, most people aren’t doing.)

To actually understand if a given workout qualifies as zone 2, she suggests a simpler approach: Pay attention to your breathing and ability to talk. In a true zone 2 workout, “if you were to get on the phone with someone, they might know that you’re exercising, but you can still speak in paragraphs, no problem,” Horan says. If at any time during a zone 2 workout you can only get out a word or sentence at a time, it’s likely you’ve jumped up to zones 3 or 4 and need to decrease your intensity to return to zone 2, she says.

Another way to think about it is perceived exertion—basically, how hard it feels like you’re working. On a scale of 1 to 10, with one being almost effortless and 10 being max effort, a zone 2 workout should feel like a level 3 or 4, Kennedy says.

Lastly, you can evaluate how sustainable your pace feels. “Ask yourself: Could I sustain the pace that I’m going at for 30, 45, or 60-plus minutes without having to slow down?” Kennedy says. If the answer is yes, then you’re likely nailing zone 2.

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Eight workouts to incorporate more zone 2 cardio into your routine

To really cash in on the benefits of zone 2 cardio, make sure each workout is at least 30 minutes long, Horan says. If your schedule allows, she suggests doing 60-minute (or longer) sessions at least twice a week, though three to four weekly sessions would be ideal. “The more time you’re able to spend continuously in zone 2, the better,” Horan explains.

The best zone 2 workouts are the ones you genuinely enjoy, because that means you’ll be most likely to do them consistently, Horan explains. Need some inspo? Here are eight examples that can fit the bill. They key with all of these is to keep close tabs on your exertion. For them to qualify as zone 2, make sure you’re staying at that level 3 or 4 and able to easily carry on a conversation the whole time.

Image: Freepik
  1. Walking. Taking a brisk walk on the treadmill or outdoors is perhaps the simplest way to check zone 2 cardio off your list.
  2. Jogging or easy running. This one is more for experienced exercisers who have the baseline fitness to sustain low effort while running. (For people newer to working it, the running motion–which involves the challenge of the “float phase,” where both feet briefly leave the ground–may inherently be high-intensity, no matter how “easy” they try to stride.)
  3. Rowing. Hop on this cardio machine to get some zone 2 work, as well as a ton of other full-body benefits, like improved coordination and great core activation, to name a few.
  4. Climbing stairs. The stairclimber machine at the gym can be surprisingly challenging, so you’ll probably need to take it at a pretty slow speed to ensure you stay in zone 2.
  5. Cycling. Whether you’re outdoors or on a stationary bike, cycling is a great low-impact form of exercise that can also double as zone 2.
  6. Hiking. This is a great way to reap the benefits of nature while also getting in some zone 2. Just make sure to slow your pace if you’re trekking on an incline to keep your effort level in check.
  7. Swimming. Another stellar choice for low-impact zone 2 work, swimming is also great for strengthening your core and activating a bunch of different muscles. Check out these tips for getting started.
  8. Very light weight lifting. Weight lifting in general typically qualifies as anaerobic exercise (which is too intense to meet the zone 2 criteria) but if you pick really light weights, perform exercises for high rep counts, and take minimal recovery, you may be able to meet the mark for zone 2, Kennedy says.

Original article appeared in Self

Fitness

I’ve been doing the bird dog exercise instead of planks to improve my core strength – it’s even better for beginners

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I’ve been doing the bird dog exercise instead of planks to improve my core strength – it’s even better for beginners

While the bird dog exercise mainly works the core muscles, improving stability and strength, it also targets the lower back, shoulders, hamstrings, and glutes, making it one of the better full-body exercises you can do.

Over the years, I’ve done plank after plank and seen few benefits. It’s just not the exercise for me. I can hold the position for about a minute before everything starts shaking and my forehead starts sweating. Even with practice, it feels torturous.

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Boutique Fitness Is Redefining How Americans Work Out. Which Drop-In Classes Are Worth Booking?

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Boutique Fitness Is Redefining How Americans Work Out. Which Drop-In Classes Are Worth Booking?


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I pushed myself too hard at the gym – and ended up in the hospital

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I pushed myself too hard at the gym – and ended up in the hospital

In January 2025, I attended my first bootcamp class.

I had spent the day hunched over my laptop, anxious and craving an intense workout that would dispel my worries. I booked the class at a nearby gym, and the five-star reviews promised the all-consuming exercise I wanted: “Militant style instructor, but very motivating,” read one. Another: “Hardest workout of my life; extremely rewarding.”

The gym was no-frills – just a room with a mirror. After a standard warm-up, we did four sets of lateral shuffle push-ups across the floor, interspersed with standing, weight-bearing exercises.

When my turn came, I dropped to plank position and started doing steady, shallow reps, focusing on my form.

But caution soon fell away. Upbeat music was booming and someone was always advancing beside me. When the instructor encouraged us to lower all the way down, I obeyed, even though my form suffered. I had rarely done more than a handful of pushups at a time, and in the final set, I was exhausted, collapsing on every rep and barely prying my torso off the floor.

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The rest of class was a blur. I became nauseated, told the instructor I needed to pause, and stepped outside to suck cold winter air into my lungs.

Back in the studio, I sat on the sidelines and waited for the dizziness to recede before slinking to my spot for the core section and cooldown.

Later that night, I felt what I thought was typical post-workout muscle soreness. I was satisfied; the ache was proof of a successful workout.

But the next day, lifting my arms to wash my face was exhausting. Searing pain kept me awake that night. Two days after the class, my arms were so stiff I couldn’t raise them more than a few inches, even to brush my teeth.

When I Googled my symptoms – pain, weakness and a new one, dark urine – something frightening came up: exertional rhabdomyolysis, a condition wherein extreme exercise causes muscle cell contents to flood the bloodstream, potentially overwhelming the kidneys. One article warned that debilitating pain after a new, intense activity was a sign to visit the emergency room.

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I went to the ER but suspected I was overreacting. After all, the internet always offers the worst possibility.

Doctors use bloodwork to test for exertional rhabdomyolysis; typically, they diagnose it if a patient has too much of a muscle enzyme called creatine kinase (CK) in their blood – at least 1,000 units per liter, or five times the normal range. However, there is little consensus on this number, says Dr Barry Boden, an orthopaedic surgeon at The Orthopaedic Center in Maryland, who specializes in sports medicine. Some recent guidelines suggest that only higher amounts – as much as 10,000 units – warrant diagnosis and inpatient treatment.

My CK count was so high the machine in the emergency room couldn’t measure it; a nurse had to do a second blood draw and send it to a more precise lab. They put me on an IV drip and eventually reported the exact number: 57,000.

Thus began my seven-day hospital stay. My mom and sister traded shifts, acting as my arms for the week – scrubbing my teeth, feeding me, washing my face. I had never felt so helpless and irresponsible. What had I done to myself?

What is exertional rhabdomyolysis?

Normally, during exercise, muscles tear a little and then rebuild. There may be a little extra CK in a person’s blood as a result, which healthy kidneys can filter out.

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But excessive exercise can harm muscle cells so much that their contents – including CK and a protein called myoglobin – overload the system. “When the cell membrane starts to break down, the chemicals within the muscle cells start to get released, which can cause damage to other organs around the body,” said Boden. “ If there’s enough of those chemicals from the muscle that reach the kidney, it can cause damage to the kidney.”

The symptoms are muscle pain (even while at rest), weakness and dark urine, though few people experience all three. Treatment involves early and aggressive administration of IV fluids to help the kidneys filter the toxins. It’s possible to manage a mild case with at-home oral hydration, but it’s always important to consult a doctor because mild symptoms don’t always mean low CK elevation, said Dr Petr Schlegel, a CrossFit trainer and professor at the department of physical education and sports at the University of Hradec Králové in the Czech Republic.

Exertional rhabdomyolysis is dangerous and fatal in very rare cases; researchers estimate that 10% of patients develop acute kidney injury (AKI), and some suffer other serious complications.

How common is exertional rhabdomyolysis?

Before I had rhabdomyolysis, I had never heard of it; I thought the worst that could come from a workout was a broken bone or a regurgitated lunch. I now know it can happen to anyone, although people with certain conditions, such as sickle-cell trait and hypokalemia, are predisposed. Despite the common misconception that only unfit people can get it, even elite athletes are susceptible.

 “Anybody can get it – anybody that’s pushed to an extreme, taking a big jump in their exercise level, or doing something they’re not used to doing,” said Boden. “Everybody has muscles, and if the muscles are damaged enough, you can develop rhabdomyolysis.”

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Boden authored a study estimating there were over 40,000 exertional rhabdomyolysis cases in US hospitals from 2000 to 2019. But he said it’s impossible to get a precise count, as no organization collects the data.

This number is likely an underestimate, as the condition is probably under-reported, said Schlegel. Since the symptoms closely resemble those of delayed onset muscle soreness – the normal ache people expect after a workout – individuals may not seek care.

Data indicate exertional rhabdomyolysis is on the rise. In Norway, Australia and the US, researchers have observed an increase in hospital records between the 2000s and 2010s. This year, hospitals in a Canadian province reported a surge in cases.

Researchers suspect the popularity of high-intensity workouts is behind the rise. They are efficient and produce measurable progress, but are risky if misused, said Schlegel: “Evidence suggests that high-intensity exercise, especially when combining strength and endurance elements, carries the greatest potential to induce [exertional rhabdomyolysis].”

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Can you prevent exertional rhabdomyolysis?

Prevention guidance has been pretty consistent since the earliest studies from the 1960s: vary exercises to avoid overloading one muscle group, incorporate rest, and gradually build intensity when starting something new or after time off.

Starting low is especially important when targeting large muscle groups – such as biceps, triceps and quads. “It’s that hyperintense going from zero to 100, really intense workouts of large muscle groups, that puts people at risk,” said Dr Bryant Walrod, a sports medicine physician and the head team physician for the Ohio State Buckeyes. Weight matters, but so do reps; an outrageous number of low-weight exercises or calisthenics – hundreds of pushups or squats, for example – is the trigger in many cases. Walrod also advises doing a different kind of workout from one day to the next.

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Eccentric exercises like push-ups – where muscles lengthen – are particularly likely to cause injury. In a 2024 article about how to prevent rhabdomyolysis in student athletes, the National Federation of State High School Associations called push-ups the “No 1 cause” of rhabdomyolysis. In April, Texas families filed a lawsuit against a charter school after 20 children were hospitalized after hundreds of pushups.

Walrod said collegiate sports professionals became more vigilant about prevention after University of Iowa football players were hospitalized with exertional rhabdomyolysis in 2011. “That case spurred better control of workouts, better monitoring, and better input from the trainers and strength coaches.”

“Where we see most of the cases is that athletes are being pushed or threatened or punished [contrary to industry standards],” said Dr Rebecca Stearns, COO at the Korey Stringer Institute for preventing sudden death in sports. Coaches are not exercise physiologists, and even when well-intentioned may not have adequate training to prevent overexertion, said Boden.

Similarly, there’s no guarantee fitness instructors understand the risk. “People may be going in unconditioned and doing too much too soon,” said Walrod of these classes. CrossFit incorporated prevention into its trainer curriculum after reports of severe cases among participants, but in general, class participants should self-monitor.

How do you identify overexertion?

I was discharged from the hospital with a firm instruction: no exercise except walking for a month. I had to learn what an appropriate challenge felt like – how to self-monitor, discern between safe discomfort and overexertion, and advocate for myself. But when is hard too hard?

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Unfortunately, sensing that something is wrong is a subjective measure; there is no universal metric.

“I never have a very satisfying answer to that, but I do think it’s a line we need to be vigilant about always, and it changes from day to day,” said Dr Natalia Petrzela, author of Fit Nation: The Gains and Pains of America’s Exercise Obsession, longtime fitness instructor, and professor of history at The New School.

“You know your body the best, and if you feel like something isn’t right, it’s time to speak up,” said Walrod. Sports medicine physicians advise people to stop exercise immediately if unusual pain occurs; in the event that there is excessive muscle breakdown, it’s critical to stop the movement right away.

Speaking up in a class setting can be difficult. Many feel self-conscious about pausing or modifying activity, especially if an instructor is singling them out. Petrzela said that she motivates participants in her class but also expresses a key caveat: “Only you know what you can do today.” She said this language “helps [them] find that very important and difficult-to-discern line”, adding that this nuance might get lost in classes with less experienced instructors who give inflexible instructions.


During that fateful class, I ignored the alarm bells. Maybe I was desperately chasing endorphins or wanted to prove to myself that I wasn’t weak. Ironically, my arms atrophied to below baseline as a result.

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Over a year later, I’m still building my strength back – but not at bootcamp. I opt for low-impact methods such as barre and pilates where I can modify if needed, and there is no need to keep pace with others.

Sometimes I tell instructors about my medical history, so they understand what’s happening if I pause. Verbalizing it also reminds me to be careful. Finally, I avoid anything new or especially difficult when I’m having a hard day.

Fitness culture taught me that pain is gain – but now I know that’s not always true.

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