An Intense Running HIIT Routine for the Treadmill
Running outside is a great way to get in shape, but the weather doesn't always play ball and allow that to happen. On those days, running on a treadmill will help you get the job done, although many runners think of that as a boring way to run. It doesn’t have to be, however, especially if you add high intensity interval training (HIIT) into the mix.












