Joints are generally designed to be compressed, not stretched. And the repeated swinging of the arms and legs, and having to arrest the momentum of the weights stresses the joints in ways they are not meant to be stressed. There is a reason The Rack was a medieval instrument of torture.
Hand and ankle weights are best avoided for cardio. If you do want to carry extra weight (eg. for walking), use a backpack or weight vest, which keeps the weight close to your center of gravity.
It is fine to use hand and ankle weights for the slow and controlled movements of strength training.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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