strengthening your heart, toning muscle, and helping maintain your ideal weight

In addition to strengthening your heart, toning muscle, and helping maintain your ideal weight, exercise may strengthen your immunity against some colds and viral infections, a new study shows. Researchers at Acadia University in Nova Scotia found that people who lifted weights for at least 30 minutes a day, three times a week, had significantly stronger immune systems than a group of similar individuals who avoided weight training.

Men's Fitness, June-July, 2004