True, but I’d say that is the toughest of any 531 program I’ve done. You have two all out sets (one at the top weight, one at FSL weight) followed by a pretty tough 5 round circuit of ring dips, pull ups, and snatches. Especially if you weight vest the circuit. Others that rely on 5’s PRO and BBB don’t come close to the intensity, but are more doable for the long run.
I’m thinking of giving it another go as the strength part of with TB conditioning at some point in the near future. I actually won’t even do the entire 2 rounds of a leader, 1 round of an anchor with it. Just a single 3-week block will be plenty.
It doesn’t specify which, but Jim talks about needing to balance the main work with the supplemental work. Since the supplemental work is hard, the main work has to be easy, so I used 5s pro. You could also just do bare minimums (so 5 reps on 5s week, 3 on 3s, 1 on 1s: no PR sets) if you REALLY wanted to conserve energy.
Those were definitely the challenging weeks, which is what I dug about the program and why I ran it 3/5/1. You get a little dip in the intensity right before you hit it HARD. Good time to get in the food.