Looking to add more oomph to your regular workouts? Power up your fitness program by cross-training with yoga.

"Yoga is a wonderful active-recovery workout for non-training days," says Kristin McGee, BFA, a certified yoga andPilates instructor in New York City. It can improve balance and stability, build strength and stamina, help recovery, lower injury risk, and help you relax, focus, and control your breathing—all of which boost your other workouts.

Your Workout

If you run: Yoga is great for runners because it stretches your quads, hip flexors, and lower back. It improves your posture and breathing, too. Try power yoga, which works your upper body and can offset imbalances from relying on your legs.

If you swim: "Vinyasa and Ashtanga are perfect for swimmers," McGee s...