Travel Fit Exercise of the Week: Mountain Climbers
Begin in a push-up position. Jump one leg forward into a low lunge position. Alternate to the other leg. The trick is to do these continually, back and forth, back and forth. John demonstrates at the start position at left, and finish at right.
Try three sets of 20 reps with your next workout. (Both legs make up one rep. For example, John is showing only half a rep above.)