By The Power of Gray Skin!

I may be primarily Physics-minded but I know Biology too:
Pokemon: Medicham
Ability: Numb
Numb is an ability that allows the user to cause muscle fatigue by forcing production of lactic acid in a person. However, in order to use this ability, the user must touch the target area that he/she wants affected. In hindsight, this ability is actually kind of lame and boring, but it has potential to defeat almost any opponent simply by fatiguing them. Additionally, allowing the user to touch your chest is generally not advised (It doesn't matter if you're a girl or a guy), because it gives him/her the opportunity to fatigue your lungs (Diaphragm, actually) and heart. Medicham used to be an amazing athlete but was banned from the Olympics (And most other sports events) after acquiring Numb. He still competes in friendly matches, though his tendency to use Numb pisses off the contenders.