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Regardless of how many times you bump this every day, no one is actually going to get trained by you if there's no real way for them to trust you. You're going to have to give out some vouch copies to reasonably trustworthy members.
It makes even less sense when there's no reason that your service would actually be better than a free one. You mentioned individual body types but as far as I know several can be covered in one free service and a person's exact current eating habits won't affect how diet and fitness programs will be good for them in the future.