Regularly using energy raising techniques can also increase your chances of improving your magical energy.
I just thought i should add this
As most all spiritual traditions teach, our bodies contain a large amount of energy. This can be called anything from chi, akasha, kai, juju, and? well, mojo. It's a raw and self-replenishing power that can be used to accomplish amazing things. What does this energy feel like? A simple way to get a vague idea is to rub the palm of your hands together for a good minute or so. You'll get a weird tingling sensation in your hands. This process seems to stir up in the energy in your hands, and is what magical energy sometimes feels like.