I recently posted in the benefits of running downhill. Here’s another article from runners world that also touts the benefits of running downhill. You are able to build muscle memory at a faster pace which uses less effort. Try practicing your race pace on some downhill slopes or in a treadmill which has a downhill grace function.
When most runners tackle hills, they focus on the difficulty of the climb. But downhill running poses its own set of challenges – and rewards.
Source: Three Tips for Running Downhill