Originally Posted by Enthalpic

I both of these “primers” make more sense than a 5min all-out effort. Even the often given explanation of “using up your anaerobic energy” is bogus, as your high energy phosphates will be fully recovered after 10min of rest (as demonstrated by 31P NMRI). All you’re really doing is pre-damaging your muscles and using up some motivation that could be used during the 20’.