I attempted the sprinting thing today. We were on a hike where we went downhill first with all the uphill at the end. Everybody was soooo slooooowwww. So I left them behind. The hill was steep so I tried to push myself as fast as I could go for as long as I could stand it, which wasn't very long. Sometimes I could run. Sometimes I could just walk faster. I think I managed to do this 4 or 5 times before I pretty much didn't have the energy to do it again. But I still had plenty of energy to get back to the car.
It was sort of fun in a way. I will try this again. It's supposed to help a lot. We'll see.