Treadmills offer a few advantages over walking outside. First, you can do it all year round, even if the weather outside is frightful. If you’re still building strength in your legs, the steady, consistent surface may help reduce your chances of a fall. You can also do more in-depth connected exercise routines with the built-in screen on these treadmills. On the other hand, walking outside is good for getting fresh air, and your legs will benefit from all the stabilization work they must do when navigating uneven terrain.