_Question:_ Why does running make me so happy?

Sri Chinmoy: Running makes you happy because you love the inner journey. The inner journey, in itself, is all happiness. When the outer journey reminds you that a higher, deeper, more illumining and more fulfilling goal is ahead of you in the inner world, then naturally you will be happy.

From:Sri Chinmoy,AUM — Vol.II-6, No. 6, June 1980, Vishma Press, 1980
Sourced from https://srichinmoylibrary.com/aum_141