We bought a lighter version of these bikes for general juggling practice and we love them. I wanted something heavier to see if I could use my hobby as a little workout and found that yes they work the arms which is great. Also, they are so heavy that they help you juggle. If you occasionally lose control of the balls, the heavier ones will help you juggle. The heavier ones are great fun to juggle and learn new tricks and keep you from losing control just like the lighter versions.
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