Sport of Disc Golf. Wrist muscle and tendon building techniques?

[LastBoyScout]

I have an original Powerball, that does not even read powerball, just patent pending in the USA. Well, after my highschool baseball career, I put it away. Now I play the Sport of Disc Golf where mainly wrist, some arm and elbow tendon and muscle bounce play a large role in adding spin and distance to the flight of the golf disc. I was wondering if anyone knew of exercises that could be completed. I have already been using the powerball to help with arm and wrist stamina, but would like some feedback from others.

Thanks in Advance!