Walking for fitness: Using weights?

Thinking of walking with weights? Take some precautions. Walking with weights can cause injury. Add weights only if you are a serious walker, you are already walking fast and uphill, and your regular walking routine has become too easy for you.
Then, start with 1-pound hand-held weights. Bend your elbows to 90-degree angles as you swing your arms and keep them close to your body. Add more weight only when the 1-pound weights feel too easy.
Don't increase by more than 1 pound at a time, and wait two weeks between increases. Don't use ankle weights. They can cause knee injuries.