OK so dumbbells can't be dynamic but they are certainly what my 11 year old son wanted to build up his muscles! He finds them a handy size to transport and work out with. Easy wipe clean from his sweaty mitts then mom can use them to tone up! Body Solid Tools Vinyl Dumbbells 10Lb - Pair - Fitness - Weights - Jillian Michaels - Adjustable Weights'
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