When people think of getting faster they think of legs, but speed is directly related to what you do with your arms. The arms stabilize your torso which lets power efficiently transfer through your hips and legs. The tempo of your arms controls the action of your feet. Increasing the speed of a correct arm swing will force your feet to turnover faster. And, if your arms cross or “flap” rather than power forward and back, your center of gravity is going to be off, your balance is off, and you lose forward momentum.