I pull my groin frequently.........
Anyway, it's not necessarily his "heart," I think the question is his head. Fighting through an injury is different from being preoccupied, intimidated, or overly confident and he's suffered from all 3 at different stages in his career. To my knowledge, no one has EVER questioned his athleticism or athletic aptitude.
And the piano, it sounds like a carnival
And the microphone smells like a beer