At first it was very hard working raising the intensity of exercise in kyBoot shoes. I got tired faster, but now I don't notice it any more. It's just harder work when I walk uphill. But I do have the feeling that it does me good. It's like exercise.
At 66 years old, I have had two hip replacements, a right knee replacement, and have undergone two major back operations. My knees had always been swollen, but once I tried the kybun shoe, they became normal again after two days. Now I can walk for hours without limping. I feel truly alive again.