Karl Knopf, EdD, former director of fitness therapy and senior fitness for the International Sports Sciences Association and retired director of adaptive fitness at Foothill College in Los Altos Hills, California. He is author of Total Sports Conditioning for Athletes 50+, Weights for 50+, Core Strength for 50+ and numerous other fitness books.
Featured Expert: Karl Knopf, EdD| February 1, 2022
Have you stopped riding a bike, bowling or playing golf or tennis because these activities are too hard to perform? Do your muscles sometimes struggle...