A good test of general fitness is to find out how long you can do jumping jacks or jump rope. These old-time calisthenics are time-tested cardio/calisthenic exertions, with no equipment needed (a good rope is good, though).
Like everything in the cardio/calisthenic area, these are not strength-builders. Done right, they have close to zero joint impact. They are endurance exercises, and endurance exercises belong in everybody's routine if they want a vigorous life. I see women and men jump-roping for 15 minutes. I cannot do that. After three minutes of either of those exercises, my form falls apart and I become short of breath, probably from not getting good breathing rhythms.
ARE JUMPING JACKS REALLY BENEFICIAL?
I'm interested in reader opinions on these things.