I never wrestled competitively but I always remember it from gym class. I could play basketball for 3 hours straight with no problem... but after one minute of wrestling where I was engaging every muscle in my body I was exhausted. This seems to follow the same idea. 1 minute of super intense activity is better than half-assing it for an hour.I actually have a pretty good quick routine that I do now. Good to know it is backed up by science!