Hop to it: Why skipping beats running for burning calories

Skipping — an exercise many people may not have tried since their school days on the playground — may actually be a great grown-up workout because it puts less stress on the knees than running while burning more calories, a recent study suggests.
Running-related injuries are on the rise, and as many as 79% of runners report injuries in any given year, researchers note online in Gait and Posture.