Hahahaha! Here's a comment. Think it's from someone on this board??
This is how we have been exercising for millions of years - running from danger in short spurts and lifting heavy objects. Endurance training stresses both our body and immune system, resulting in inflammation and decreased bone health.
Run some sprints or lift some heavy objects - it's quick, fun, and more heathy than beating up your joints with jogging and other chronic cardio.