Thank you! I suspect early on our key markets are going to be fitness, fashion, and skiing, but mostly because I have the most connections in that world, and those things are already popular.
This guy has already been through YC, and been at Apple for 7 years (where you need to be a hard worker to last). His idea may or may not be good, but I can bet he's gonna work his ass off.
Working your ass off is not sufficient to ensure success.