Tone Up Your Arms With Tennis

Michelle Obama's sculpted arms may be due to her tennis game. It makes sense: Slamming or lobbing a ball over a net works your arms. Your forehand swing is also good for your chest, and your backhand for your shoulders. Tennis has another advantage: While not primarily aerobic, it can still help burn calories along with fat. Less fat gets your muscles noticed, no matter what activity you do.

Swim for a Strong Upper Body

Swimming laps is good for everything above your waist. Pulling against the water provides resistance for your arms. Doing freestyle, backstroke, or butterfly uses the deltoids in your shoulders and pectoral muscles in your chest. Swimming is less helpful for the legs simply because people tend not to kick very hard. So if you want to work your legs harder, use a kickboard.

Mix It Up on the Elliptical Trainer

By fusing the motions of stair climbing and cross-country skiing, the elliptical trainer gives your thigh and gluteus (butt) muscles a rock-solid workout. Hold on to the push-pull resistance handles and you'll also strengthen your upper body, including your back and arms. The gliding motion is much easier on your joints than running even while it burns fat. Best of all, you can do it inside, rain or shine.

Pedal for Fit Legs

Biking is great for your leg muscles: quadriceps, hamstrings, and calves. You can make the workout more intense by using toe clips, which let you pull the pedal up, as well as push it down, which gives you some extra resistance. If you're a beginner, skip the toe clip on a moving bike, as it can make it tricky to get your foot out of the pedal. Or challenge yourself on a stationary bike by adjusting the resistance.

Run for Your Whole Body

Like biking, running and jogging are good for your calves and thighs. Because they're weight-bearing exercises, they strengthen bones to help protect against osteoporosis. They are high-impact activities, so they may be jarring on your joints. So start off slow, especially if you're overweight. It's fine to switch between walking and jogging, too. That's easier on your joints, and varying your pace (interval training) is a good challenge.