Thanks Andrew. The reason for my question is high/max rep pushups are just easier/more time efficient to do because they do not require going to a gym or buying equipment.
I would not be mixing high rep pushups with low rep, heavy weight and as a former gym bro, I already have more muscle and strength than I need.
I guess my question should have been given my situation do I really need to follow the 3 x 4 max strength protocol? or can I get away with doing high rep calisthenics like a military selection training plan.
I like your point about the fatigue cost. It hasn’t gotten in the way of running yet, but I noticed doing high rep core, pushups and pull ups on top of my run is making me pretty sore.