Hello, I'm pretty much a total beginner to the world of cycling, but I would like to start getting some exercise that also involves getting out of the house. I have an extremely small budget, but even if I did have a larger budget, I don't want to spend that much until I'm sure that I'll stick with it. From reading through these forums, I hear that the best option would be to go to my local bike shop and get fitted and all that, but as I said, I just really don't have the money for that. I am 6'0'' and weigh about 230lbs. I was browsing my local craigslist and found 2 bikes that seem promising and would like some opinions on which one to purchase. I will most likely only be using the bike in my neighborhood (paved streets, sidewalks and all that). I'm looking for feedback on the price as well as the bikes' suitability for my needs. Any help is appreciated.
2008 Trek 4300 ($250)
TREK MOUNTAIN TRACK 820 ($120)