I did a 473.25 at the USAPL nationals when I was 15. Had to sleep on hardwood floor for 3mos after that. Have bulged so many times since then, I cannot begin to count. Lateral head of my gastroc fires only 50% of time in left leg, but have feeling back anyway. It's not that it's unsafe, it's just when you're young, you're dumb. Teen lifters really need a couch, imo.