 Subjects will be seated in a stable chair, with the feet on the ground and without back support, and asked to perform 3 rounds of resisted shoulder flexion and resisted hip flexion on each extremity. A submaximal resistance will be applied manually by the investigator and held for 30 seconds followed by 30 seconds of rest. After, they will be asked to lift and hold a 25 lb weight for 30 seconds 3 times, followed by 30 seconds of rest between each trial. Then they will lift the weight 10 times repetitively in a faster paced rhythmic fashion set by a metronome. They will then rest in the seated position for 5 minutes to measure recovery heart rate and respiration. 