Running is not for me. I’ve tried it in the past, I did the couch to 5 k. Very proud of myself, I stuck with the program. However, my knees started to seriously hurt, even with good shoes. What is another good cardio exercise to do besides running?

Do not underestimate walking! At a good clip (I’ve heard it called “walking with purpose”) you are working your heart and lungs. Biking, if you live in a bike-friendly town. If you have access to a gym, the elliptical machine is easy on joints. Swimming also! But if you don’t have a gym membership (I don’t!), walking is great. There are free videos out there — you could do cardio classes!