You don't need to head to the gym or buy exercise equipment when you can get a great workout with just your body. If you happen to be taking your kids to the playground or just want to take your workout outdoors, the playground makes for a excellent, free gym.
The playground workout video above from the Art of Manliness conditions and strengthens your whole body. Find more details on all the moves in this circuit in their original post.
That workout is pretty intense. An alternative to work yourself up to that level is this set of playground exercise moves from Parents magazine.
(Note: As Art of Manliness cautions, if you don't have kids accompanying you and you're a guy, it's best to head to the playground when no kids are there, lest you look like you're there for the wrong reasons.)
Playground Workout [Art of Manliness]
Full-Body Playground Workout [Parents]