Barry's London Canary Wharf

With their focus on high calory burning and their ominous-sounding “Red Room” exercise space, the Barry's gyms aren't for the faint of heart. Their instructor-led HIIT classes are designed as challenging workouts where you'll burn upwards of 1000 calories per hour and achieve fitness levels you didn't think were possible. After the gruelling workout, head to their Fuel Bar to rehydrate, recharge and recover.