Water Cardio

For a workout that puts less wear and tear on your body, just add water. Water-based activities, like swimming, water aerobics or hydro cycling, can be just as effective for boosting cardiovascular health, but with less force on the joints.
 For people who are overweight or have arthritis or other chronic pain, water workouts can help take the ouch out of exercise and lessen the risk of injury — all while protecting your heart.

Sedentary people who begin a fitness regimen can reduce their risk of a heart attack by 35 to 55 percent.