Dancing is a great way to raise energy. In my opinion, it's effective because if you dance hard enough and long enough, it puts you in a state of no-mind, where your conscious mind is sort of shut off and not filtering the experience. You can produce and take in more energy because of this.

I make use of this frequently! However, do be careful. If you're doing this at a crowded club, for instance, there might be energies there you don't necessarily want to pick up, or things you don't want to attract by making a huge energy display.