The most important part of the set to increase PR

Typically, strength trainers are focused on one specific goal, the PR (personal record), especially for those compound muscle group routines. For example; the squat dead lift or the bench/dumbbell presses. Whatever your style maybe it is important to stay focused on form. Move in a controlled direction. Keeping track of your progress is the key to personal development, whether it is with help from a lifting partner or dedicated equipment, like the USDB300, when you need it the most.