Delayed-onset of muscle soreness (DOMS), which occurs after heavy resistance-exercise, may inhibit muscle performance if adequate muscle recovery is not achieved. Whole-body vibration (WBV) is a new emerging strategy which may decrease muscle soreness following exercise. However, the effects of WBV vs. traditional aerobic exercise prior to and following resistance-exercise are unknown. Purpose: To investigate the effects of WBV prior to and following resistance-exercise on body composition, muscle strength, muscle endurance, and muscle soreness. Methods: Young exercising adults (N=40; 18-25 yrs) will be matched for age and body mass and then be randomly assigned to one of two groups: Whole-body vibration (N=20; 2.5 mins before and after resistance-exercise; 3x/week, 10 weeks; 3 sets of 8-10 eccentric reps/set, 9 exercises) or Aerobic exercise (N=20; 2.5 mins before and after resistance-exercise; 3x/week, 10 weeks; 3 sets of 8-10 eccentric reps/set, 9 exercises). The primary dependent variables to be assessed prior to and following the study will include body composition (muscle, bone, fat; dual energy x-ray absorptiometry), muscle thickness (ultrasound), strength (1-repetition maximum leg press and chest press), and muscle endurance (total number of reps performed over 3 sets at 70% baseline 1-RM for leg press and chest press). Daily muscle soreness (questionnaire) will be assessed prior to each training session.