Is a deadlift supposed to be done whitout any rounding at all in the back area? I tried deadlifting for the first time ever this week and when i pulled 462ibs for tripples some guys in the gym sayed i was doing it wrong, that i should arch my back the whole way, i did not feel any discomfort in my back at that moment but they sayed that I will injure myself pulling that "much" weight and i shouldnt try to lift that weight if i cant arch. Whats your take on this?