No athletes train this way. Ever. You might ask yourself why you want to train like an athlete. Athletic training gives us the current 'best practices' for fitness training. McGuff et al vigorously defend their model, but a lot of it is based on Carpinellis's flawed meta-analyses of single set vs multi-set. On top of that, the Body By Science stuff completely neglects training the heart, erroneously claiming that you get all the conditioning you need from that style of training. That style of training does nothing to improve the heart's ability to pump blood, nothing to improve proprioreception, and is definitely second tier for muscle building.