High-intensity interval training, or HIIT for short ... intensity during an easy 20-minute run. Build up to ten 60-second, near-all-out bursts during a 40-minute run. From there, progress to ...
Most high-intensity interval training (HIIT) workouts are a joke — there I said it ... The Effect of High-Intensity Interval Training Periods on Morning Serum Testosterone and Cortisol Levels and ...