Having to accelerate and deccelerate the weights with every swing of the arms stresses the joints in ways they are not meant to be stressed. Joints are generally designed to be compressed, not stretched (there is a reason why 'The Rack' was a medieval torture device).
I agree with Archimedes - walking faster and adding hills to your route are much safer ways of adding intensity to your walking. But if you have maxed out both these options and want to add more, you are much better off carry extra weight close to your center of gravity with a weight vest or backpack than in using hand weights.
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.
| current weight: 178.0