Why would the recommendation for someone who is busy with a startup be anything different than the recommendation for any other busy professional?
If you absolutely have to feel productive, go spend an hour on a treadmill, bike or elliptical listening to tech podcasts or something. Typically you won't be able to do intense, short-burst training while doing this. That's ok, a bit of long slow distance won't kill you.
If you absolutely have to feel productive, go spend an hour on a treadmill, bike or elliptical listening to tech podcasts or something. Typically you won't be able to do intense, short-burst training while doing this. That's ok, a bit of long slow distance won't kill you.