Our family spent a week in Hilton Head, South Carolina. One of the highlights was sailing on Stars & Stripes, an actual America's Cup racing yacht. The wind wasn't exactly cooperating that afternoon, but I came away impressed by the story behind the boat.

For 132 years—from 1851 to 1983—the United States had never lost the America's Cup.

Then Australia changed everything.

As a chemical engineer, I love stories like this because the winning idea wasn't simply, "Let's build a better boat." Instead, Australian designer Ben Lexcen asked a different question.

Everyone had been refining the sails, the hull, and every visible part of the yacht. Lexcen wondered whether the real opportunity was underneath the water.

A sailboat's keel is the heavy fin that hangs below the hull. It acts like a counterweight to keep the boat from tipping over, but it also creates drag as the boat moves through the water. For decades, designers accepted that tradeoff.

Lexcen didn't.

He designed a keel with small horizontal wings at the bottom. Those wings produced hydrodynamic lift—similar to how an airplane wing creates lift in the air, but underwater. That allowed the keel to be shorter while generating the same righting force, reducing drag and making the yacht both faster and more stable.

It wasn't a bigger sail. It wasn't a stronger crew. It was a better idea.

The Australians were so secretive about the design that they surrounded the boat with screens whenever it was in port so competitors couldn't study the keel before the races.

The result was one of the biggest upsets in sports history. Australia ended America's 132-year winning streak, and four years later Stars & Stripes was built to win the Cup back.

Sometimes the biggest gains come from the things no one sees—consistent recovery, quality sleep, good nutrition, enough protein, and staying healthy enough to train week after week.

The most important part of your fall training plan might not be the part everyone notices.