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without conditioning, your Kung-Fu is empty.
Can you truly say you can do a tiger claw, if you haven't trained and developed your hands/fingers/grip?
Can you truly say you have a strong bridge,...

we use the roller bar for more than simple conditioning.
It is used primarily for power development. How you roll it, how you snap the arms to throw it to your partner, how you catch it, how you...

forearms? No. I use it on my shins!
Yeah, I also use it on my arms, but I am not consistant, I must admit.