LES MILLS SPRINT is 30-minute High Intensity Interval Training on a bike. It’s built on the sport of cycle sprinting, which means you’ll be taking your training to the next level with a workout that’s all about speed. LES MILLS SPRINT is not your usual cycle class. It's a quick and hard style of training - short bursts of intensity followed by short periods of active recovery - that will give you fast results with minimal impact on your joints. The payoff is that you will keep burning calories for hours after a good workout. HIGH-INTENSITY INTERVAL TRAINING (HIIT) ON A BIKE Born from the sport of cycle sprinting, LES MILLS SPRINT is a 30-minute workout with intensity.