There's been a hysteria in place over the last many years,

But Serena Williams is right, albeit not as funny as she might have been: his statement is not factually based. 700th? Where did that come from? McEnroe was meaning to say, “She needn’t think she’s all that; there are plenty of men in the world who could beat her” but he overegged it with the number 700, which is a rather hysterical guess.

The trouble with hysteria is that it's contagious.

We've studied this from many perspectives in women and in men, and we get the same answer: It's not the obesity, it's the fitness.

This is something everybody can do. And you don't even have to do the 30 minutes all at one time. If you fit in three 10-minute walks, get another 2,000 or 3,000 steps, that's great. You are beginning to get close to a healthful dose of physical activity.

We have a public health problem of overweight and obesity, but it's been blown out of proportion, ... We focus on obesity and not on other health habits and other risk factors.