You can run at an additional 35 miles per hour than you could without powers, without breaking a sweat, 60 miles per hour if you really push yourself. Your legs have a small breaker effect that allows you to run without taking damage. You can exercise to increase your total speed, but your speed with your powers on will always be an additional 35 miles per hour without breaking a sweat and 60 miles per hours if you really push yourself. You might want high-quality shoes.