I like to ride my bike because I can sometimes enter the flow state where my sense of self sort of fades away until I almost have an accident. Then my sense of self comes comes rushing back. What motivates me to keep riding my bike is I know there is a fat man chasing me and I have to stay ahead of him.
This guy named Andrew Huberman is a really interesting guy to listen to on YouTube. He talks about how physically moving forward can greatly reduce our level of stress. Half a league, half a league, half a league onward.