There are body builders, whose genetic potential allows to have huge hands, without spending especially many efforts for this purpose - for example A.Bekls. Even before competitions it seldom does more than 10-12 approaches for a biceps and triceps, 2 times a week. Meanwhile, others give to development of hands much more time and all the same cannot be made even to Beklsom. However any bodybuilder at the serious approach to this question can increase considerably volume of hands and improve the form of a biceps and triceps.