Twice-Weekly HIIT is Superior to Four Weekly Sessions to Improve Endurance

Hello Friends, 

Whether you’re a hard-core endurance athlete or weekend warrior, we all adhere to some sort of training “principle” when designing our exercise routines (at least you should). Many of these principles are well accepted. For instance, it is generally agreed upon that the best way to stimulate improvements in something like VO2 max (how muc…