Burpees are one of those exercises that will challenge you no matter how fit you are. To break it down a little what you're doing is pitting yourself against the planet, using your muscles to fight the pull of gravity. This is why it can reduce grown men to tears. It does also give you results. You're taking on the planet. All of it! Everything else after that seems like an anti-climax.
Extra Credit: 30 seconds rest between sets.
