I have COPD (recently diagnosed) and use an oxygen concentrator 24/7. I have a small machine I take when I go away from home. I need to exercise, but walking with this concentrator is not easy, so I am looking for either a treadmill or recumbent bicycle. I am leaning toward the recumbent bike since I have bad knees and this would not be weight bearing.

Is anyone out there using a recumbent bike? Do you like it?