Darryn Willoughby, Ph.D., FACSM, FISSN, CSCS, CISSN, CNC Exercise and Biochemical Nutrition Laboratory Exercise Nutrition and Resistance Training Research Unit Dept. of Health, Human Performance, & Recreation Baylor University, Waco, TX 76798, USA [email protected]; 254-710-3504 Importance of Resistance Exercise and Muscle Strengthening in Aging Muscles