If your tap water comes from a well, test it for arsenic. Drinking water with moderate levels of arsenic can up the risk of heart disease.

Have you had your well water tested for arsenic? Levels of the natural element above 12 parts per billion (ppb) are linked to a greater risk of heart disease, especially among smokers. According to the Environmental Protection Agency, the current drinking water standards allow up to 10 ppb of the contaminant. Anything higher than that and you should seek other sources of drinking water. In addition to heart disease risk, long-term exposure to drinking water that contains more than 10 ppb of arsenic increases the chances of lung, skin and bladder cancer. Because it has no smell, taste or color even at high doses, arsenic can only be detected through lab tests. Find an EPA-certified testing facility by visiting epa.gov/safewater/labs.

That's it for now, until next time, good luck with your training and remember, if you have a question, log on to the Virtual Trainer Expert Forum and have your question answered by a panel of experts. In addition, be sure and check out the Racer X Virtual Trainer archive section. Your complete one-stop information zone for motocross fitness.