10 Your hands turn numb from bike riding.

Long bouts on the bike or a marathon indoor cycling class can leave you with tingling fingers—or no feeling at all. "Numbness occurs when a nerve is irritated or injured," says Dr. Kruse. "In cycling, it's common to hold one position for a long period of time, which sometimes puts pressure on a nerve." This numbness typically goes away on its own, but if it continues, consider working with a professional trainer familiar with fitting bikes (many bike stores train their staff to do this) to obtain an appropriate fit or adjust your riding position. Still numb after that? You may have an underlying condition (such as carpal tunnel syndrome) and require a medical evaluation.