anything with fitness such as weightlifting, bodybuilding, weight cutting, diet plans, bulking plans and much more. no need to spend 100$ on a personal trainer (:
Great concept! I would suggest adding in specifics about what you can offer. In addition to your list, maybe give a couple examples of common questions you could answer for your clients, and what they can expect by ordering 1 gig: one video, one plan, the answer to one customized question, all three?, etc. Good luck!