Folding bikes are NOT made for exercise. they are made primarily for getting from A to B and back to A. NOT for getting up to speed and taking out for your intended use for long rides. I sell Dahon bikes and although well built you should check to make sure the one you are looking at is not one that was recalled this year due to clamps that fail! You would be better served with a Hybrid bike of the same gearing for loosing weight as the Dahon will not likely last long for the use you intend. Folding bikes are made for leisurely rides only!