but now I'm hearing that they push too... :screwy: I should say, by pull I mean contract.. and by push I mean expand... can someone explain this? I'll elaborate on my question. when you do a curl, your Bicep is pulling the weight. Your tricep is not pushing it... but not I'm hearing that (at the cellular level or something to that effect) that the tricep does actually exude some force, however small, and does push the weight. I understand that muscles do not only contract, they also expand... but from my understanding the expansion is just the muscle relaxing to it normal form, and that there isn't any pushing force there. All the force is in the contraction... know what I'm talking about?