I used to swear by high-intensity cardio workouts to keep me fit. As part of my CrossFit style training regime, I’d do at least three 10- to 20-minute HIIT workouts per week that would leave me breathless, sweaty and with my heart rate in zones four (80%-90% of my maximum heart rate) and five (90%-100%).
However, I was becoming bored with this style of training and I was beginning not to enjoy HIIT style workouts anymore.
