Hey all,

My first post. I've just recently got into biking, and actually started mountain biking about a year ago. I'm now interested in starting to commute to work to save some money and get some exercise. My ride to work is about 7.5 miles each way, and I've decided to not use my Gary Fisher X-Cal 29er, as its a little too much bike to ride to work. Just had a few questions:

- I'm not overweight by any means, I'm 5'8 and 150 lbs, but I'd still like to tighten and tone up a bit. I eat fairly well already, but my question is this: will 15 miles a day riding (7.5 each way), get me into shape? I hate working out and I love riding bikes, so I was curious as riding to work is something I'd really like to do.

- I want to get a solid bike that will last me a while, and is good for both commuting and fitness. Not necessarily a road bike as I dont care much for racing it. I'd like to buy New as I havent had great luck with craigslist. I've saved a bit and my range is around $500-600. I've had good experiences with Trek, so right now I'm really leaning towards a Trek 7.2 FX or 7.3 FX. Anybody know anything about those? Any good? Link below:

http://www.trekbikes.com/us/en/bikes/bike_path/fx/73fx
Thanks in advance!