OMG..."arching" your back is proper technique? were not talking about a power lifter in a competition.i guess bouncing the curl bar off your pelvis,ARCHING your back and swinging the weight up is proper too,huh? do you wonder why when your doing 30-45%, for example, of your max that you can lower the weight nice and slow, smooth, pause and then return to the starting position while keeping your feet planted and without having to arch your back? it has to do with core strength. it isnt until you get higher and higher in your weight that your back starts to arch and you flex your calves, lifting the heels off the floor, ever wonder why that is? many would agree that the weight is too heavy and he is trying everything to "will" the weight up.besides making it easier, how would arching a very new lifter's back benefit him? power lifting competitions are much different than a newb beginning in a gym