Will exercise make you happy? I do not think it will make you happy in and of itself, but it can help. You need to reach in and generate happiness. Do not look at exercise or any one person or thing to make you happy.
Yet studies have come out, as one recently in Nature Medicine, showing how hormones that may induce happiness are increased in level during and shortly after exercise.
In the past, exercise has been linked to increased levels of endorphins and serotonin, which make us feel good. Serotonin levels increase after chocolate ingestion. So don't eat that chocolate bar, exercise instead.
The Nature Medicine article showed that the gene for nerve growth factor known as VGF was enhanced with exercise. this nerve growth factor has an anti-depressant effect.
My third book, Pocket Guide to Fitness, is available on http://www.authorhouse.com and http://www.amazon.com. If you look up my name on those Web sites, you will find my other books The Boy in a Wheelchair and Life, Work and Play: Poems and Short Stories. These two books are on my Web site http://www.louizapatsis.com.