Just because there are more candles on your cake doesn't mean you should cut out your exercise regimen. In fact, studies show that the older you get the more important fitness is to your physical and mental health. More than 100,000 older adults will join together in the name of good health for the 21st annual National Senior Health & Fitness Day, set for Wednesday, May 28. Senior centers, retirement communities, health clubs and more will hold events that encourage seniors to get moving. You can do the same with one of these gifts.