Ask HN: Making my app mobile?

Hey guys, So I've been working on a fitness app for a couple of months now - its still in its early stages, but its closing in on 200 members pretty quick. That said, as I continue to work on and improve the app - the greater need I feel for a simple mobile version (i.e. logging in and data entry). My question is this: should I make a quick and dirty version for mobile browsers so it can work on all devices? Or should I focus on releasing an iphone app for now (which would take me longer than the mobile browser version) and come back to android/blackberry apps later (probably 6-8 months down the road)? This isn't going to be a huge value prop for the product, just kind of a needed feature right now, so I don't want to spend needless amounts of time on it while the product still needs more iterations, and the team is comprised of just me. About the app - its for weight lifters, not the average joe looking to get skinny. (feel free to give it a look at liftrr.com)