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.
Suspect? That means you don't have customers or know where to find them. Prove that first. Otherwise you're just another business guy offering nothing in exchange for 100k+ worth of technical skill.
Oh, get over yourself please. HN has this huge disdain for "business guys" but there are tons of "hackers" that aren't worth their salt either.
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.
By "suspect" I meant those are the customers that I can see the need already. I understand the sentiment of needing validation to commit significant time to an idea, but I'm also a big believer in rapid prototyping and getting something in a limited number of users hands to work the kinks out before going for large traction. It's the classic chicken and egg problem. Can't have users without a product, can't build a great product without users.