today i head up to the gym and ready to lift, did a few warmup sets of incline dumbell presses and was feeling pretty strong. anyway, i set them on my knees while sitting and getting ready for a heavy set. as i kick them up though i get this pain in my lower back off to the right side. i probly could have done the set but just decided to stop as it was pretty strong pain and didnt feel right. ive had this before but the other time it came up when i was doing preacher curls, my back will be completely fine then i do some type of motion and all the sudden its ****ed up. last time it went away after a few days but wanted to see if anybody had any idea what im talking about or what the problem is?