Hey Sue...I actually have a recumbent bike but when I ride if for more than 10 minutes my leg gets really sore and stiff. It's loose and I can ride it for almost 30 minutes but when I ride too long I sure feel it when I hop off. Doesn't bother me at all though while riding. Did she start slow and then keep increasing because I would have thought by now I'd be ok. My range of motion is 117-121 and knee flexion is great. just get so sore and stiff.