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.
Lift your left foot off the ground, jump forward, and land on your right leg. Jump for 20 yards on your right leg and try to keep your raised foot off the sand. Switch and jump back with your left leg. The key is to brace your core on each jump, which will give your abs a serious workout as well as control your landings.