thank you sir eddie and bchemist for the clarification. i actually feel a pang of pain in my back when i'm near my 1RM doing squats and deadlifts. i should have one nearby in case i'm gonna do my "heavy set." i also see some guys who wears their belts when they are doing incline/decline bench press, leg press and hack squat.
by the way, what exercise/s is best to improve my grip? i'm doing some forearm curls (and reverse) in high reps and i also try to hold on to a 50lb. plate for each hands. does this in anyway improve my grip strength?