at the ymca i work out at, there are always little kids that only work their chest and bicep.. my friends even want to do that when they want to work out with me.. i say we are doing back and bicep, after doing like 3 sets of back they decide that they want to bench press or do curls.. i just tell them that they can do that, but im sticking with my routine.. my friends dont come with me anymore
and walking away from a machine for 45 seconds with intent to return to do more sets does not mean " fair game ".. a group of kids my age started taking off my weights when i was 10 feet away from my bench , i told them that i was still using it and they continued to take the weights off.. so i decided that i was going to muscle my way through them and lay back down on the bench and tell them to leave the weights on. it worked.. i never saw those kids again.