Maybe 'feeling good' People might not get "high" but might "feel better" from exercising. There are many reasons for that: experiencing release of endorphins, knowing they are getting more fit, seeing themselves lose weight and gain muscle, realizing they are helping their families by setting a good example and staying healthy for them! Thanks for asking. @drpam.
Runner's high. There's a feeling called the "runner's high", a feeling of happiness that runners feel during and after a good run. It's certainly (and thankfully) not a high like doing drugs or drinking too much.