Imagine a landscape in front of you as barren and endless as your eye can see. And then imagine that your task is to cross it, on foot, through eye stinging dust storms, unbearable heat and a body willing you to stop with every step. Welcome to the Sahara! Welcome to your "marathon of the sands". Aptly named the Sahara meaning "The Great Desert," it is a land-mass almost as large as Europe or the United States! Making it the largest hot desert in the world, second only to Antarctica, which although not commonly thought of as a desert because of its cold climate, is classified as such when the amount of rainfall is measured. The cheetah may be the fastest sprinter on the planet – reaching from 0 to 60mph in less than 3 seconds! But what about over long distances? In this incredible video from Life of Mammals, we see how different animals respond to the challenges of survival that require the use of their fitness and strength.