Emily Oster surveyed a collection of studies on walking and running speeds, which she summarizes at FiveThirtyEight.

Oster concludes:

If we take this research at face value, we learn a few things.

First, some exercise reduces your risk of death.

Second, the optimal walking/jogging exercise is light to moderate jogging.

Whats the Optimal Speed for Exercise?| FiveThirtyEight

Photo byGiorgio Galeotti.