Hi Knipps, I'm a pretty avid exerciser too, and sometimes I feel that lack of energy too. Using a B100 complex vitamin has helped a lot with my energy levels, and recently my brother in law (who is a cyclist) turned me on to the Powerbar gel packs. I'd heard of them, just never tried them. I know it sounds strange, but sometimes when I feel a little low on energy in the afternoon and I know I want to go home and exercise, I use one of those little gel packs. The chocolate is my favorite and it also helps to quell the middle of the afternoon junk food urge.