Performing more than three sets of challenging exercises can lead to fatigue that prevents proper movement execution.

“these are challenging for me especially doing more than three sets after you've contracted your muscles really hard in the way that you're supposed to for these exercises in the three you're not going to have the sort of fatigue that you experience after sprinting or after doing heavy deadlifts or something of that sort but it's a certain kind of fatigue that prevents you from performing the movements properly”