[panick21_]

Yes. That's why I march quickly with a heavy backpack. That should be zone 2.

Then occupationally I try to do sprints uphill, walk down. Get ready for another uphill sprint. I have been lazy on that unfortunately.

There is also a lot of evidence that sprinting is really good. I mean if you look at the bodies of Olympic sprinters vs Olympic runners, what do you want to develop?

[vrc]

Sprinters also lift a lot of weights. The extreme example is sprint cyclists, who are jokingly called weightlifters who happen to ride a bike [0]

[0] https://www.reddit.com/r/pics/comments/4xioza/track_cyclists...