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Craig's avatar

Glad you're on substack.

You had a profoundly positive influence on my life as far back as 2008, when you recommended reading Good Calories, Bad Calories.

I enjoy your writing because it applies to a lot more than physical training.

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Ian Holmes's avatar

You know... if you put enough weight on a sled being pushed on a rubber floor, the floor will start to burn. As the runners heat up, they also start to stick more, meaning that each successive attempt to move the sled gets harder. At a certain point, the sled can no longer be moved, despite the load staying the same. This is a bit like pushing/pulling a heavy tire on its side on asphalt. It gets worse the more work done. This becomes an exercise in mental fortitude as much as it is physical work. The task becomes harder the more you do.

I don't really care that much about how someone pushes a sled. Change the way you push it to gain a mechanical advantage and we simply increase the load until you hate yourself. If you want to challenge the posterior chain, and the muscles involved in hauling dead weight through snow... use whatever position allows you to load that tissue and then maintain a lot of time under tension. The real issue is trying to make it easy and call it the same work.

Though personally, I take more issue with the fact that most sleds are pushed on turf. Or they get wheels.

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