You don't have to do a strenuous workout five times a week. The key is regularity. If you follow the ayurvedic principle of balaard exercising to half your capacity you can exercise every single day without straining your muscles. Walking is excellent exercise for everyone and excellent therapy as well. The early morning is ideal for taking a 30-minute walk. It will not only help your heart, it will prepare you for the day by charging up your circulation and your metabolism.