A gliding joint allows for smooth movements because the bones that help the movement glide past each other to encourage movement. A place where a gliding joint can be found is between the carpal bones in your wrists. A condyloid joint looks like two bowls and are similar to gliding joints; however, they differ because the surface where bones move past each other is irregularly shaped. An example of a condyloid joint is a radio-carpal joint which is found in your wrists.
The reason he does not have any signs of illness is because of his metabolism. He has a very fast metabolism which means he get rid of his food faster and it also digest faster!