I can normally deadlift 405x8/10 reps with the one hand over, one hand under grip. Tried today for first time in ages to deadlift with double overhand grip, i moved the bar about an inch off the floor and had to put it down!
I think my grip sucks, but i don't want to keep using alternate hand grip incase i damage my biceps.

At the moment i swap which arm is doing the underhand grip inbetween sets to make sure grip is developed evenly.
I've seen people lift super heavy poundages with double overhand grip and no straps, how do they build their grip up that strong?! do you have to use chalk
