I agree :-p. If you want to exercise, and are going in a group, you can simple hike forward and backward in the trail, to make sure everyone is doing ok. When hiking in groups, for example with families, we do that, either some adult or a kid with a lot of energy is asked to go forward and then backwards to tell us how we are doing, and they enjoy the explorer role, while at the same time the little kids, or the grandparents in the group are also kept the loop and accompanied the whole way.