I saw this dude with legs not much bigger than mine (about 25") doing lunges with 405. I was wincing thinking about his poor knees. You have to wonder though what's the point of doing lunges with 405? He'd walk out of the rack about 6 paces and then with 405 on his back, he'd turn around semicircle and head back toward the rack. This semicircular move didn't seem like a good idea either. Although I'm impressed with his strength, I concluded that there is no point in doing 405 lunges. Too risky don't you think? I think he was just showing off.