Great defense doesn't require fouling. Learn the footwork and anticipation skills that shut down drives legally.
Street ball defense is all about angles. Most defenders reach because their feet are out of position before the drive even starts.
Stay in an athletic stance — knees bent, weight on the balls of your feet, hands at hip height, not waving in the air.
Never cross your feet laterally. Practice sliding in both directions for one minute straight, focusing on staying low throughout.
Watch the hips, not the ball. Ball-handlers can fake with the ball and eyes but their hips always go where their body goes.