5. Next the Isometric Strength of the knee extensors, knee flexors, plantar flexors, and dorsi-flexors will be measured. The participants will perform the strength tests from a seated position with the knee and hip joints at 90 degrees flexion. When testing ankle strength, the ankle will be at 90 degrees. Once participants are in the proper position they will be attached to a linear force transducer. Participants will slowly increase the force of the muscle group being tested for 3 sec from 0 to maximum. They will be instructed to produce maximum force for 3 seconds and then relax. Each muscle group will be tested at minimum 3 times. Testing will end when either there is a decrease in force between the last 2 trials performed or the force produced is less than 5% of the previous trial.