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The most impressive part for me was that he can code whilst doing 6mph on the treadmill.

He can't, it's just a filler to avoid the "you're not healthy" comments, even though this entire routine is unhealthy.

I can and do. typing actively then 3-4mph, if thinking deeply about a coding problem and occasionally typing then 6mph.

What do you type on? Do you use a VR headset or do you have some sort of screen?