Recently I heard about them and I don't know what exactly they do to physically allow you to bench heavier.
Anyone can please explain it?
Also if it allows you to bench more, then does it help to build muscle that will one day bench the same weight without the shirt? Sort of like say you used some supplement and got stronger and used heavier weights, but at the end your muscles did lift those weights?
Or is it just a way to transfer some of the weight to the shirt or something, so your muscles aren't really benching the used weight?
Thread: How do bench shirts work?