I was looking at the Clickbank.com
marketplace the other day and I came across a few sites selling information products on increasing your vertical leap.
I had no idea why anyone would pay $97 and higher to learn how to jump higher.... then I realized something.
Basketball players want to jump higher so they can dunk!Other sports are also interested in vertical jumps as well, so there is a huge market for this type of product.
How you would create it, I'm not sure yet. I think the best bet would be to buy a course someone is selling already and investigate what they have to offer.