my doctor told me i had chrodromalacia that i need swimming or statioary bike for lowimpact my knees are weak and painful sometimes. He gave me antinflammtorys told me it might go aw ay in two weeks of talking the antiflammtorys. i dont have easy access to a pool so i ordered a stationary bike .Who here likes their stationary bike? And i wonder still if it will bother my knees too?My doctor said the height must be right on the bike or it can do the opossite and hurt my knees but on the other hand he said if the height is right it should strenghtens them .He said not to keep the muscle weak but not to over use it too.