How heavy is the easy part, just keep going up, warming up is the most important part. Wreck your shoulders and the pain won't even let you sleep at night. It cost me $280 a month to have my shoulders worked on. The doc used his hands to tear up the facia and muscle in my pec, arm, and shoulder, he was seperating the nerve from rubbing against the bone. The most brutal shit anyone could possibly feel but no surgery or shots and my shoulder is 100% good.