It has a shock absorber in it so it, like, Shhhh, makes this neat sound when you jump around on it. All right.

First thing for my wife, and the most common thing I hear from my patients, particularly in the 40 to 80 year old age group, 70 year old age group, is they come in and say, Hey, Doc, isn't there just a shock absorber you can put in my knee?