Had a meeting with another client today, someone who hasn't seen me in a while, and he asked me, "How's Rhythmball?"
I threw my hands up over my head and said, "It's working!"
His response? "I can tell."
I am noticing more muscles in my arms -- long, lean ones -- and my waist is becoming more whittled. It's great motivation to keep going. So buy one already! And then get a paddle and ball for a friend, so you can keep each other honest. :)