By Daniel Heller, MSc, CSCS, RSCC High-intensity interval training (HIIT) is in vogue. Part of its appealing nature is the relatively short time commitment. But there’s more to it. HIIT combines short, high-intensity rounds (rate of perceived exertion [RPE] 9-10 for 30-90 seconds) with very low-intensity rest periods (RPE 2-3 for 30-90 seconds) to recover … Continue reading Exploring Different Types of High-Intensity Interval Training