very good advice thank you.. workouts release hormones?
If you're tired all the time and not living the lifestyle of a college frat boy then you might have some thyroid issues.
Are you moving around a lot? If not, that could be your problem.
To be honest, I feel my strongest in the gym after a decent laborous day at work busting up foundation floors with a sledgehammer to replace main drains. It's not slave-like labor, but gets the blood flowing pretty good.