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.
Get on all fours. Your arms should be shoulder-width apart and your feet slightly wider behind you. Simultaneously place your right hand and your right foot forward, then switch to your left hand and left foot. Crawl forward 20 yards, then back, returning to start position.