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.
Place your hands behind your head, elbows up. Bend your knees and drop into a squat. Keep your spine long and your chin forward. Stay in this low position and duck walk until you hit the 20-yard mark. Turn around and repeat.