Hey guys I need help choosing what 3 day split would probably work best for me between these two routines. Im 6'0 160lbs, and want to gain muscle mass. I have the hardest time gaining chest muscle. I also have boxing training 3x per week which is pretty much all cardio and bodyweight exercises, so I really want to be careful and not overtrain.
I heard that Chest/Tri is good for not indirectly hitting other muscles, which can lead to overtraining. But I also heard that if you're doing only 1 body part per week it can start to shrink before the next time to do it comes around. And by doing the Chest/Back split you will indirectly hit chest while doing triceps. Just enough to keep it from shrinking, before you blast chest again the following Monday.