Best gym classes for runners

Project Fit, £20 (first class is free), London

Project Fit is a high intensity interval training (HIIT) studio where the workouts combine intense cardiovascular interval training using treadmills with body transformation exercises. You’ll be pushed to your limits and leave stronger and fitter, helping you become a better runner. HIIT training improves your overall fitness by pushing you to work harder and engages the aerobic system at a more intense level. Body transformation exercises help strengthen your muscles aiding injury prevention, making Project Fit the perfect workout for runners!