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It's not. Try rock climbing or climb the wall so you can see for yourself. I've done both. The rock climbing I did was 30 ft up no rope in tennis shoes. There was nothing for me to grasp my hand around. Everything was an open hand grip. Find a place to grab was mostly cracks and ledges in the rock to grab on. To this day I don't know how I didn't fall. I remember how my fingers tips hurt, how my hang was cramped, and that after a certain point the option to climb down was no longer possible. You should give it a try so you can see the difference.the functions of the forearms & hand muscles are the same as in Barbell pinch gripping. I have explained this to you over & over again. regardless of what you post .