Racquet sports such as tennis, racquetball and squash are not only good cardio workouts but also good weight-bearing exercise. During this type of activity, there is beneficial impact and resistance on your racquet arm (your wrist, arm and shoulder). That's what you need to help boost bone density. Racquet sports will also help increase the strength of your hips and spine, as well as lower your risk of developing chronic disease such as type 2 diabetes and hypertension [source: Brehm].
Bone density testing, also known as a DXA or DEXA scan, is a way to detect how strong your bones are, your risk of developing osteoporosis (or if you have already developed it) and your risk of suffering a bone fracture. The test measures the amount of calcium, as well as other minerals, present in your bones. The greater the amount, the stronger your bones.