It looks like this guy's calf has become host to some fetal alien life form ready to burst out at any second. But apparently it's just a nasty post-workout leg cramp. Luckily this champion maintained enough foresight through the pain to capture the whole creepy phenomenon on his phone.

via dogzfan

Any doctors in the house care to explain? From my unprofessional judgment, it appears that we should amputate immediately.