Vitamins are good for you. Most people agree. However, here is another good reason to take vitamin supplements: Exercise can also be a stressor capable of producing free radicals -- substances that are potentially damaging to the body's tissues.

Since several vitamins and minerals help prevent free radicals from causing damage, a multivitamin is a good idea. Here's an even simpler way to look at it: When we work out, our need for several vitamins and minerals increases. Taking a multivitamin to replace what's lost during exercise makes perfect sense.