I know this subject has been discussed already. I'm looking at bi's right now for this thread. From what I've read, people say to wait until your 10's, or your 5's, and some say even post 5's to start with a set or 2 of isolation. I understand this so far. What gets me though, after doing one cycle all the way through (with awesome results), is that my bi's are killing me in post 5's by just doing my compounds. I don't think i could do heavy isolation work at this point without possibly sacrficing my compound progress on the next workout (recovery time). But in 15s, 10s, and even most of the 5s, my bi's are hardly ever sore. The peeps here say it's not really needed during most of these cycles though. What am I missing? Shouldn't i want to incorporate say a set or 2 of hammer curls even before i get to the post 5's or normal 5's so that my bi's get some doms? They haven't grown at all until i actually hit the post 5's (heavy chin-ups, pull-ups, rows). Or am i going about this all wrong? What has been said and wait i'm observing contradict each other. It's cool to see the bi's grow though in just 2 weeks. Should i just toss the idea of isolation work all together for my bi's since my compounds are making them grow? Thanks for your help.