last night at the gym i was working on chest. i started on the decline machine and warmed up w/ 135, then i did 225 for 10 reps. after this my shoulder starting feeling very sore and i had sharp needle like pains. i just ignored it since i felt sore during many workouts in the past. the next set was for 275, as i was bringing the bar down to my chest i heard three loud pops in my left pec near my armpit. someone about three feet away from me heard the pop and helped left the weight of me. i usually go to 315 on decline bench so this wasn't unusually heavy weight for me. the doc said a tore the pec muscle and will probably not be able to lift for a month. has this happened to anyone and if so did you keep lifting and just change your routine around? i really don't want to miss a month from the gym and loss all my hard earned gains.