gym does not do it for me at all, as it&#x27;s not really aerobic, and hiking in general requires too much brain power figuring out where to put your feet to allow me to get in the flow state plus in general it&#x27;s not intense enough for long enough.<p>For me it really seems like working out at a high enough level that you&#x27;d have to stop after 1:30 or so that does it, if I have longer rides (I have ridden up to 5 hours) it does not seem to be hard enough, while if you go shorter it&#x27;s too hard, there just seems to be something about the hard-but-manageable-effort that does it for some reason<p>Same deal with running, when I was marathon training and running for 2+ hours it did not happen as often as it did when I was half-marathon training and I was focusing on 1-1:30 workouts