I never have energy no matter how regularly I work! Me and my wife joke about just getting me a wheel chair and rolling me around I get that exhausted.
You know something? The only thing I noticed for myself personally is that I don't run out of breath when I walk around a lot. But no matter how lightly or what I do when it comes to excercise I am always sore and easily exhausted, I'm not sure if having energy is 100% connected, but at the same time I don't really know.
Maybe most people who have more regulated breathings the more they walk generally feel with that more energy.
Hey I don't know if they work but you could always try an Energy drink and give that a test run.
Demon Changeling Pisces #22....that just about sums it up.