We’ve encouraged you to consider walking, circuit training, yoga and biking as among the best forms of physical activity you can do for your heart. If you’re looking for the biggest bang for your buck, it might be swimming. It gets all of the major muscle groups involved, emphasizes steady and deep breathing and gets the heart pumping without jarring impact. Research also shows that the buoyancy of being in the water triggers relaxation for most people. If you’re on target for 30 minutes of exercise five times per week, make a trip to the pool as part of your plan.