Hey I'm looking into getting into getting a bike for myself to start exercising and getting into shape. I'm 6"4 and weigh about 235lbs so I'm a big guy. I went to a local bike shop and the guy there, a 19 year old kid was telling me to get a 2012 hardrock specialized 29" with disc brakes for $580. I don't know much about bikes actually I know nothing about them lol, but since I'm just started to get into it I don't want to spend more than $700 or so until I figure out if it is something I am going to stick with or not. Does anyone have any opinions on the bike the guy suggested or any other ones that would be worth getting in the $500-$700 price range? Looking for advice from real people that love riding bikes and not a sales person thanks!