If I were to sell a downloadable fitness program i.e. a PDF, even if it was the best in the world I would image 80% of people taking advantage of my "no questions asked 60 day money back guarantee". So in an ideal world I would probably offer a PDF download in addition to something like ClickBank University where login details would be supplied and the customer would get gradual access to maybe training videos, program updates and other content every 1-2 weeks until the guarantee offer is long closed.
It's not an ideal world because time and money are tight so I was trying to imagine a way I could do something similar in a simpler form initially to ensure low refund rates on my site / ClickBank but I am not too sure.
Any advice appreciate.