Cooling off the pros

When Novak Djokovic recently used a palm cooling technique during changeovers at a hot Miami tournament, many observers were confused about what the tennis great was doing.

One person who was not surprised? Former champion and current commentator Martina Navratilova, who obviously knows the secret that many other elite athletes already know.

Although, Martina: it's not magic. It just feels like it.

Read more here.