BEST Upper-Body Workout This is BEST (Bill’s Enduro-Strength Training) Upper-Body Routine. 5 exercises of 10 reps each, done back to back. Three minutes to do 50 reps. Then walk it off for 2 minutes. Catch your breath, then repeat for a total of 5 pentavals in 25 minutes (5 in 25 or 5-25 technique). A no-rest set of 50 reps (demonstrated here) is called a Pentaval. It’s a strength training interval. The workout is one you can do at home or a gym. Just need free weights. Interval cardio is built