7. The Rock
Have you ever noticed how The Rock lost a step near the end of his match against Cena at Wrestlemania XXIX? That wasn't just fatigue — that was a muscle tear. In a Twitter Q&A with fans in 2013, The Rock was asked about his biggest ah-ha moment. He replied,
"My biggest 2013 "ah ha moment was tearing my quad & adductor from my pelvis. God's way of saying "slow down son"
There's some dispute as to whether it was a hamstring tear or a quad tear. But whatever it was, it hurt. If The Rock ever needed a reminder of why he left sports entertainment for the relative comfort of Hollywood, this must have been his wake-up call.