My train coach, Louis, reassures me, ‘Don’t be concerned. This is not going to be a beasting,’ as he straps a heart-rate monitor to my arm. ‘We work collectively to seek out the precise depth and you then set your personal tempo.’

Puzzled, I search for the definition of beasting on my telephone – ‘punishment meant to humiliate, push to the restrict and damage (often army)’. What have I let myself in for?

I have never set foot within the gymnasium for greater than 35 years, postpone by the shouty male instructors, harsh lighting and basic air of physique fascism again then. 

Like many middle-aged ladies, I like endorphin-boosting train, however it must be light and non-competitive. I stroll 30 miles every week, swim thrice, do Pilates. But when it entails Lycra, rely me out.

But Orangetheory Health, the cult gymnasium studio franchise, based in America and rising in reputation within the UK, the place there at the moment are 9 studios, claims to supply a special kind of train class.

Group and inclusiveness are the watchwords. It is for individuals of all ages, sizes and styles. Michelle Obama is a fan and, if you happen to watch Netflix present Queer Eye, you will recognise it because the place the place the Fab 5 take purchasers.

Might this treatment my gymphobia?

Orangetheory (or ‘Orange remedy’ as followers name it) runs hour-long circuit lessons divided between time on the treadmill and rowing machine and weights and energy workout routines akin to lunges and squats on the ground. It is a group class, however you go at your personal tempo in line with your personal heart-rate information.

Everybody is about up with a coronary heart charge monitor on their arm. This tracks your beats per minute and the info is projected subsequent to your identify on digital screens within the room so you may see what number of energy you are burning and your common heart-rate percentages.

But Orangetheory Health, the cult gymnasium studio franchise, based in America and rising in reputation within the UK, the place there at the moment are 9 studios, claims to supply a special kind of train class

The purpose is not to be flat-out for the entire time, however to raise your coronary heart charge, enhance metabolism and enhance cardiorespiratory well being.

Sadly coronary heart well being is not good in my household. My father and all my grandparents died of coronary heart assaults early in life.

Afamily historical past of coronary heart illness is outlined by having a first-degree male family member who had a coronary heart assault by age 55, or a first-degree feminine relative by age 65. My dad had his first age 54.

After I consulted a number one heart specialist not too long ago, he informed me bluntly to chop out weekly chips, undertake a Mediterranean food plan and do extra fat-burning train. I am match however a bit of bit plump – which is harmful with my household historical past.

So may heart-rate based mostly interval coaching age 60 on the dreaded gymnasium make a distinction?

I e book into Orangetheory’s studio in Fulham, South-West London. I am anticipating an orange-clad cult. And, sure, the lighting does make the entire room look orange and the super-fit coaches do have a touch of Baywatch about them, however they’re type, enthusiastic and make you are feeling their best purpose is to get porky midlifers into form.

Everybody is about up with a coronary heart charge monitor on their arm. This tracks your beats per minute and the info is projected subsequent to your identify on digital screens within the room so you may see what number of energy you are burning and your common heart-rate percentages

At first, Louis guides me via the 5 heart-rate zones individuals undergo as they work out. Gray is whenever you’re relaxed; blue is the straightforward warm-up zone; inexperienced – the ‘endurance zone’ – is whenever you’re feeling challenged; then there’s the orange zone when issues begin to really feel uncomfortable. The pink zone – the highest one – is reached at most effort. 

‘It is like your mother-in-law’s home,’ jokes Sean Johnson, Orangetheory’s regional health supervisor. ‘It is superb to pop in, however nobody needs to remain too lengthy.’

The purpose is to spend a 3rd of the exercise (20 minutes) within the orange zone and the remainder in inexperienced. However the stage of effort required will rely in your physique and medical historical past.

I’ve by no means completed interval coaching earlier than. The session begins on the rowing machine, the place I discover myself having fun with the exercise of muscle tissue, abs, legs.

Louis encourages us to extend our efforts, get our coronary heart charge up and transfer from the warm-up gray zone to inexperienced.

Quickly everybody’s profiles are lighting up inexperienced, orange and pink on the overhead chief board. Disappointingly, mine would not budge past gray (aka a relaxed tempo).

I’ve by no means completed interval coaching earlier than. The session begins on the rowing machine, the place I discover myself having fun with the exercise of muscle tissue, abs, legs

Then, It is A Knockout-style, the group dash to the opposite aspect of the room to attempt energy workout routines. Whereas everybody else is twirling weights round their head, I am nonetheless attempting to get my ft out of the rowing machine’s Velcro straps.

I benefit from the Whole Physique Resistance train (stretching utilizing wall-mounted resistance bands), and it is good to see my profile has moved to blue. I already elevate 3kg hand weights at house, however combining weights with lunges is hard. I am weeping by the third set of reps and shocked by how unfit I really feel.

We transfer on to the treadmills the place you may run, jog or stroll. I go for energy strolling at 4 miles per hour. As we change the incline as much as 10 per cent (to extend the gradient), I lastly get my first inexperienced zone studying and really feel triumphant.

After, Sean takes me via my outcomes (common members get them by app). After one high-energy, adrenalin-pumping class, I’ve burned 308 energy in an hour and walked 3,000 steps. As compared, I needed to stroll seven miles the day earlier than (14,000 steps over 5 hours) to burn that quantity.

Sure, the lighting does make the entire room look orange and the super-fit coaches do have a touch of Baywatch about them, however they’re type and enthusiastic

I used to be within the inexperienced zone for 16 minutes. My peak coronary heart charge was 131 beats per minute (ideally for my age, it needs to be 80-136). Energy strolling on an incline is low-impact however will strengthen my posterior chain (the muscle tissue within the bottom and glutes), Sean says tactfully.

The day after my session my thighs are in agony – have they ever moved this a lot earlier than? After I check my blood strain with my Omron house monitor, it is down from Grade 1 Hypertension to Excessive Regular. I hate interval coaching however even I can see the purpose of getting out of your consolation zone.

Orangetheory is much less about physique constructing and extra about ‘coaching for all times’; bettering energy and co-ordination so you may stroll up stairs, carry purchasing and different issues that may slip in later life.

So sure, I agree to return each week. And really do! I’ve even managed to hit the orange zone a couple of times and I am much less breathless climbing hills. I’ve a nasty feeling I have been transformed.

• Orangetheory Health studios throughout the UK provide a complimentary class trial. Membership choices in London begin from £109 per thirty days or £199 for ten lessons, orangetheory.com