What's up bigun'

There are actually different kinds of gripping strength. Theres holding, pinching and squeezing. I'm leaving out a couple but these are the main ones. The absolute best one for grip strength is farmers' walks. You can do these about once a week, maybe even every two weeks. Also, after every workout try hanging from a chinning bar until you fall off. These are two of the best for being able to grip a barbell. The next best one is to hold a barbell for as long as possible. Load it with 225-315 and hold it until it falls out of your hands. Then repeat. Don't do all these in the same week. Just pick one and do it after your workout. The only exception is hanging from a chinning bar, you can do that 3 times a week if you want.

Good luck