Well, recently I have developed 'runner's knee' in both of my knees and a Baker's cyst in the right. Cyst is not painful but the knes are very painful, after sitting awhile. I'm looking for suggestions for aerobic exercises I can try to keep my heart/lungs in shape while this condition clears. Swimming is out. Thanks.

'Often mistaken, never in doubt'

'Ignorance more frequently begets confidence than does knowledge' Darwin