I just started going back to the gym. Lately I've been working alot, I end up going after working 14 hour days or so, so I just kind of stumble around from machine to machine, and maybe stare out the window for a short while on a tread mill (knee surgery gives a lot of pain so I don't use the treadmill nearly as much as I should) 2 weeks ago (unusually cold so I was unusually stiff) I get drug to the gym, I decide I'll wake up on the leg press, start off nice and light, leg press then use the machine as a calf exercise. After each set I am a little looser and limbering up so I up the weight. On the 3rd set the machine is maxed at 410 lbs, I pushed it up real fast and forgot to grab the handles, the weights went one way, I went the other way and I heard a loud pop from my back... I hope I can get back to the gym next week. I am thinking about getting a trainer, could definitely help.