I got this little rings just to try out. I tell you I never knew how weak I have gotten with age. It is sad...really sad! I could barely squeeze one of these with both hands. Nope, I am not saying which trainer ring. I definitely needed these alot more than I thought. It is also a good stress reliever. Reality check as well, think you are about to knock somebody out and get knocked out with no power in those hands and arms. LOL Seriously though, it is great and I feel them all up through my arm. I think soon all of this jiggly flubber hanging on my arm will be gone. At some point at least my arms will be summer fine and cut up! On a serious note, I know people doing rock climbing should definitely look into the full set of these. It will help one hundred percent.