Sorry man no advice here. But I will say one of my good friends dad is a lil skinny dude and has won a few arm wrestling competitions against MUCH bigger guys. He claims it's all in form and grip manipulation. I realize that size does matter to a degree but its just crazy how he beats some of the guys he does. His hand eye coordination is out of this world. He can take glowing red beer bottles out campfires and juggle them. I don't think arm wrestling is a true test of a mans strength. Others may disagree.