Matthias Schlitte is a 22 year old German arm wrestling champ. He may look like he has been masturbating with his right arm since puberty.
In fact he been training for 6 years to grow his massive right arm for competitive arm wrestling!
Schlitte is actually quite ingenious. If you think about it, by only increasing the size of his one forearm and no other part of his body, he has allowed himself to arm wrestle in lower weight classes.