I came to that conclusion about 15 yrs ago. I'd been in a paralyzingly depression for several years which none of the med changes had helped. I was fairly active, but I decided I wasn't active
enough. I thought if I kicked my exercise routine into high gear, surely I'd kick start the energy that was virtually absent from my life.
I got a personal trainer, set up a routine beginning at the gym at 5:30 am. For a solid year I force myself into a productive, active lifestyle. And progressively my depression deepened.
Skip down the road a few years and I undergo a break down sufficient to warrant a month's hospitalization resulting in a new diagnosis, new meds ... so my depleated energy, sustained depression, etc was not laziness or any other lack on my part. I was sick, but not properly diagnosed or treated at the time.
So be careful. Like me, could be you're sick--misdiagnosed, improperly treated. Don't precipitate a crisis.
Roadie