I have a Trek Navigator 100, and I'm too heavy for the suspension in the seatpost. I asked the guy at the shop where I bought it if they could swap out the spring for one with more strength, but he said the seatpost suspension never really does much anyway. The Navigator 100 has a more upright posture than some bikes (are all Trek Navigators that way?), and I really like that better. My wrists hurt on traditional bikes where your upper body is mostly horizontal and you either use your back muscles to maintain the posture or end up putting all the weight on your wrists.
The only con to biking I've had is hills make my knees hurt. If you have any knee trouble, stick to flat places (at least at first) or just walk up the hill if it feels like too much for you. I find biking to be really fun and relaxing. I get an occasional bug in the teeth and my butt does hurt after a 10 mile ride, but it's worth it.
Where I currently live (city) it would be insane to ride my bike, but my boyfriend and I like to drive out to the country paths on the weekends. I'm hoping that since I've been walking I've been building stamina so I can keep up with him!
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