The things I like to do involve a lot of mental focus, a combination of physical and mental challenge. That is what… — John M. Grunsfeld Copy Share Image
I think when you go through any surgery, your body changes. And with that, it can be probably the toughest mental challenge… — Sue Bird Copy Share Image
“As muscles waste with no gravity or strain so is our minds when there is no mental challenge or substance to digest” — Dr. Lucas D. Shallua Copy Share Image
Playing sick. That is so hard to do. It has to be a total mental challenge, as well as the physical challenge. — Michael Jordan Copy Share Image
