Hello, I've been invited to go on a bike ride this weekend and I'm not sure if I should try it or not. A group of friends is going on a 45 mile ride to another town. It's on a developed trail that is flat the entire way. I'm not a biker by any means and haven't riden one in a few years. I'm in good shape physically, I just don't know if I'm in 'biking' shape. I have all day and there are towns spaced about 10 miles apart that I can rest in/refuel. Is this a bad idea?