No gym? No problem. Melina Christidis, a certified personal trainer in Southern California, designed this full-body strength and conditioning workout. Do it two to three times per week. Three times through the circuit is one workout.

Pushups (25 repetitions): If you can't do a full pushup, or you tire in the middle of the set, you can do them on your knees.

Squat jumps (25 reps): Stand with your feet slightly wider than hip width apart. Drop your bottom down, shifting your hips back and keeping your back straight and chest lifted. Try to lower to a 90-degree angle, keeping your knees over your ankles. Make sure your knees don't go farther than your toes. After you complete the squat, jump up. Land in the starting position and repeat.

Jumping jacks or jump rope (25 reps): You know the drill!

Plank (1 minute): Get into pushup position, with your hands under your shoulders and your body in a straight line. Don't raise your hips up or let them sag. Hold this position for 30 seconds. Work up to 60 seconds.

Burpees (25 reps): Bend down and put your hands on the floor. Then jump back into a plank position. Do a pushup. Then jump your feet back up to your hands and jump straight up. If you're a beginning exerciser, skip the pushup.