Get your heart working! Our hearts are actually muscles and must be used. 30 minutes of exercise everyday, or an extended workout of an hour and a half 3 times a week will help to prevent future heartaches (and I don't mean those with someone you fancy). Taking brisk walks is one pleasurable way give your heart a workout. Jumping on a rebounder, (a small trampoline) gets the heart pumping, the circulatory system flowing, and the lymphatic system going. It is claimed that 10 minutes on a rebounder is equal to 25 minutes of running.
If you get some money over the holidays and enjoy fitness gadgets, consider investing in a heart rate monitor. For the cardio exercises they talk about above, the monitor-which can sometimes constitute a watch attached to a strap that you wear around your chest-can help give you an idea of how effective your workout is by monitoring your heart rate.