I did mine.....Yea it is tiring....and you will feel it the 2nd day after! but you know that you are using your muscles.....YOU FEEL IT....
I use a 10lb ball and when I stared I could only make it to the letter F.......Now I make it all the way to Z, so I am getting ready to start doing 2 reps.....
If you so it while putting on some music, you can get a double whammy...your heart rate goes up so I think you get a little cardio while using the weight at the same time, I could be wrong, but it is not your traditional boring machine that you sit at to use weights....I like it, but I have to say IT TAKES A WHILE TO MAKE IT TO ZZZZZZZZ.......
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