It’s actually easier on the knees than a treadmill in my opinion. It does take some getting used to because of balance. I used my walker the first couple of times in front of it so I could brace myself if needed. I bought some Nordic walking sticks to use with it and that helps the balance.

I can assure you Teresa, riding a bike is excellent for people with knee problems, as it is a regular , no jarring movement. It actually improves the knee, as the exercise strengthens, both calf and thigh muscles, which tightens and protects knee joint function