They could offer an advantage over normal lenses for sport by reducing the glare of light and sun.

There was a glare, the sun was still coming up, and … I couldn't see. You could just hear it. I didn't know if it hit the pin and went long or what happened. And then, obviously the crowd let me know what was going on.

There are two kinds of light - the glow that illuminates, and the glare that obscures.

Using them can also strengthen the body through a range of motions by working across a number of different planes and through different directions. You can bend, twist and lean with them far more effectively to target muscles specific to different sports.

Although we breathe mainly through our nose when resting, during exercise when we begin breathing harder, the air coming in is predominately supplied via the mouth. It may improve airflow through the nose, but there is no evidence that it reaches the lungs and boosts performance.

Definitely not. Eating fruit in the morning, like Claudia Schiffer, is fine, but countless studies show if you eat nothing, you will make up for it by consuming more high-calorie foods later.