Barry’s Bootcamp

Since launching in the UK in 2013, Barry’s has become one of the most sought-after boutique classes around the world, with branches in Dubai, Paris and Melbourne as well as its LA base. There are now five studios in London, all offering the same, heart-raising formula of sprints, incline runs and strength training. Each class combines 25 minutes of cardio with 25 minutes of weights, burning a whopping 1,000 calories in one hit. Only the brave need apply to Barry’s Hell Week, a seven-classes-in-seven-days challenge. Exhausting but euphoric, Barry’s is unlike any other workout you’ll try.

WHERE? Canary Wharf, King’s Cross, Queensway, Shoreditch and Victoria

HOW MUCH? Classes from £22

VISIT: barrysbootcamp.com

1Rebel

If you don’t live or work near a Barry’s, 1Rebel’s Reshape is the next best thing. Suitable for all fitness levels, sessions focus on the upper and lower body as well as abs, leaving no muscle untoned. Constantly switching between treadmill sprints and heart-pounding HIIT moves is a sure-fire way to boost fitness and has earned this class cult status on London’s gym scene. Refuel post-class at the resident Roots & Bulbs café – the protein-packed Whey Of The Gods smoothie is a personal favourite. 

WHERE? Angel, Bayswater, Broadgate, South Bank and St Mary Axe

HOW MUCH? Classes from £16

VISIT: 1rebel.co.uk

Precision Running Equinox

Using shock-absorbent, slat-belt Woodway treadmills that closely mimic outdoor running, Equinox’s Precision Running class is a state-of-the-art offering. Sessions are built around different interval routines, and while some are run-only, others feature a handful of strength circuits with resistance band moves designed to complement the running. Instructors also offer constant guidance on form and technique, making this the perfect class for keen runners training for a race or cardio junkies looking to boost endurance. 

WHERE? Kensington and St James

HOW MUCH? Membership only; prices start from £215 

VISIT: equinox.com

KXU

Keen to try a treadmill class but not ready to commit to 60 minutes of straight running? HIIT & Run at KXU is one to try. Trainers at this luxe Chelsea studio (the pay-as-you-train version of members’ club KX) are some of the best in town, think ex-professional athletes and injury specialists, so you can rest assured that both beginners and pros alike are in good hands. Sessions are an endorphin-boosting combination of treadmill speed work and HIIT exercises using kettlebells, dumbbells and bodyweight. Pricey it may be, but it’s worth it for the rose gold changing rooms alone. 

WHERE? Pavilion Road, Chelsea

HOW MUCH? Classes from £26

VISIT: kxu.co.uk