Hi, I haven't cycled in about 20 years when I used to zip around in my trusty red BMX when I was a kid. Due to a disc injury on my lower back, the physio has recommended taking up cycling as a form of exercise. I would very much appreciate recommendations on what bike to get. I really don't fancy going on the roads as I actually don't want to create traffic but was thinking more of a bike to go cycling on quite flat and even bike trails near our area. Any advice would be greatly appreciated 
