http://www.muscleperfect.com/testamatol/

Testamatol Aim to mix up your grips for working out the back. When doing deadlifts or rack pulls, use mixed or staged grips, if you want to attain more strength. This sort of grip assists you in twisting the bar in one direction, so your underhand grip starts twisting the bar in the opposite direction. This helps you keep the bar steady, rather than having it roll all over the place.

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http://www.muscleperfect.com/testamatol/