By Barbara Morgan Getting back into exercising can be a great way to improve the health of your heart and lungs. If it's been some time since you've been active and done cardio, recumbent bicycles might be a wonderful choice. These bikes have a larger seat and provide a rest for your back, which makes things easier on your whole body while you are out and about. If you've had a back injury in the past and do not want to tweak it again by riding a regular bike, this style might be exactly what you need to get back on the open road. As long as...