You don't get to be the slow creature in an Aesop's fable for nothing.
For one, Mental Floss informs us in this video, tortoises don't need to step quickly because they're herbivores -- and plant life doesn't run when you hunt it.
Check out the other reasons, explained in the clip. The tortoise can still take comfort in knowing that slow and steady wins the race, at least in storybooks.
h/t Laughing Squid