I read swolecats theory on hitting smaller muscles with their corresponding larger parts. I did back really hard the other day, 12 sets(3dead, 3bent overs, 3tbar, 3 chins) and was super sore. I finished off with 6 hardcore sets of bis 3 sets of hammers followed by 3 sets of preacher 6-8 reps.) Wasnt sore in bis ? Not only that when I trained bis with tris on their own day, bis wouldnt get sore, but tris would. Have the same problem with shoulders but to a lesser degree. I getsuper sore the following day from all other body parts except bis and shoulders, what gives?