Well if he was hypo or feeling hypo the last thing he needed to do is exercise You say he is in a great deal of pain due to hips and knee problems, then perhaps exercise is not an option. Have you thought about a joint (sorry pun not intended) exercise plan? Can you both swim, if so perhaps think about the local pool for a dip as this would be non weight bearing.. But then again if his blood sugars are so high his body will be incapable of doing very much at all. So first priority is get the blood sugars down, then start some gentle exercise.