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Kettlebells add good variety to cardio and/or calisthenics workouts. There are plenty of ways to use them, but they seem most often used for swings. Swings are a total body exercise.
With lighter weights, swings are more cardio. Go with heavier weights for total body toughening. 30-60 seconds per set is good.
Hi Dr Bliss -
I'm 83, have lost most of the use of my legs after 50 good years due to post-polio syndrome. Can you suggest kettlebells or some such exercise to help me keep some measure of conditioning?