The recognition of the propulsion factor, which is the number of times the foot hits the ground combined with the ability of the leg, hip flexors and knees to propel the individual forward, has shown direct relations between leg muscle strength and speed. Weight training is one popular way to increase overall muscle strength, and this study supports the use of weight training as a means of increasing leg muscle strength in non-professional runners. This study was created to demonstrate the link between greater muscle strength, achieved through weight training, and increased speed in non-competitive runners. By demonstrating first that weight training results in stronger muscles and then that these muscles are utilized in increased propulsion force that increases speed, this study supports the theory that speed and muscle strength are directly related.