Just do something fun and outdoors! It's summer time get off your butt and go hiking, swimming, running, etc. you can even try some gymnastics (just remember that nature's equipment is not as structurally sound as engineered equipment ie. the structural integrity of cedar bark is not enough to support a flag from a 165# individual - see pic). Getting some fresh air and a little sun it will do you good.
Elbow lever - Place hands facing backwards on object. Stab elbows into stomach on either side of belly button. Lift head and legs slowly until straight. Open elbow angle to bring body horizontal. (Tutorial)