Dry sand is just about the perfect training ground. Its uneven surface keeps your body guessing, it's forgiving on your joints, and it randomly displaces and shifts under your weight, forcing you to engage more muscle. For this high-intensity workout, mark off a 20-yard stretch of beach (no, probably not a good idea to do this mid-afternoon in high summer). This will be your lane during the regimen. Try for five circuits. After completing one, immediately do 10 push-ups, then rest for 10 seconds before beginning the next circuit.
The Sand Circuit Workout
10 minutes to work every muscle.
Cross-Body Mountain Climbers
Get into a push-up position. Brace your abs and pick your right foot up off the sand and slowly bring it across your body toward your left elbow. Return your leg to the start position. Lift your left foot up toward your right elbow. Alternate sides for a total of 20 reps on each side.