"Yoga is a wonderful active-recovery workout for non-training days," says Kristin McGee, BFA, a certified yoga and Pilates 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.
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 says. "Each pose is linked to the breath and flows together just like swimming." These types of yoga also work your muscles, which helps you swim better.
If you bike: Try Bikram yoga, a.k.a. hot yoga. "The sweat factor is high, so hardcore spinners and cyclists feel like they're getting a good, sweaty workout," McGee says. Plus, many poses open up your chest, hips, and upper back, which can offset those hours you spend hunched over a bike.
"I tell my clients to do yoga 2 to 3 days a week to keep muscles flexible," McGee says. Do it at home with a DVD or an app.
"You don't have to do yoga classes all of the time to reap the benefits," she says. Do a few downward dogs, planks, chaturangas, warriors, and lunges before you work out. Post-workout, try static stretches like forward bends, hip openers, and deep twists.
Remember: Cross-training should enhance your fitness program, not harm it. Don't push yourself into poses that don't feel right.