Lower Back Exercise from www.fitsugar.com

Wellbody reader Hong Nguyen wrote to share a terrific little exercise that takes no equipment and minimal space. For travelers, it's a great way to stretch, strengthen and unwind in a hotel room after a long bus ride, cramped plane flight or all night on the train. (Lay a towel on the floor.) Also convenient as part of a regular workout in cozy quarters. Pairs perfectly with abdominal crunches. 

Hong learned the exercise in Vietnam and has taught it to her nieces and nephews here in the States. "We would lie face down, keeping our arms and legs very straight," Hong writes. "Then we try to lift up our legs and arms as far from the floor as we could. I named this exercise Doing Shark. A bonus: it does not take lots of room space to do it!"

Doing Shark, or Superman, strengthens and stretches muscles in the abdomen, legs, arms and lower back. Also popular with yoga practitioners, it's described in detail on the PopSugar website.

Visit Wellbody Academy's Playdium to play Exergames and try out the Whirligigerator, a contraption that links your kinetic movements to huge dancing, spinning, flipping humanoids.