I've never read or had it explained to me the benefits of doing a Chest/Tri's or Back and Bi's split. I cant understand it to be honest. I mean, say you do Back, go all out, and then you go do bi's but their fatigued already from doing back, same with Chest and Tri's.

When I train, I like to go all out and not have muscle's already fatigued from previous body parts. I've given these spilts a go hoping I was missing out on something training this way but itwas totally annoying because I was unable to lift hardly anything when training the second bodypart. I find I cant lift nowhere near what I would have done if I would have trained these body parts on sepeate days, thats real annoying.

Just curious as to why people would want to train with these spilts and the possible benefits ?