Like skiing, tennis emphasizes anaerobic fitness. Jumps and sudden direction changes build the agility, reflexes and plyometric power you need to navigate a mountain. Bursts of running and an athletic stance strengthen your lower body, while wielding a racket tones your upper body and core muscles. Be careful, though: Your torso gets a lot more action in tennis than it should in skiing. Don’t carry that extraneous motion back to the slopes.
What It Works biceps, triceps, shoulders, upper back, obliques, gluteals, quadriceps, hamstrings, calves
Insider’s Tip Tennis rivals yoga and espionage for the strange positions you can find yourself in. That means flexibility is a must. To ward off injury both on the court and on the hill, maintain a full-body stretching routine throughout the summer. To get started, visit and type in the keyword “stretching.”