Another practical use is you always stay fit but get to eat pretty much whatever you want. Because running at super speed will burn an immense amount of calories, you need a constant intake of them, but they'll burn off, so you pretty much stay in peak condition. You could eat anything and just vibrate for a few seconds and burn it off.Well this was just season 1(him becoming the flash) and I'm not aware of all his powers but thanks for the info