The TB12 Method: Inside the strict fitness and nutrition lifestyle that allows Tom Brady to dominate at an age most players retire

Steven Senne/AP

• At 41 years old, Tom Brady is as dominant as ever, something he credits to his strict, regimented lifestyle.
• Brady has divulged his training and diet secrets in the form of his book, "The TB12 Method" and more.
• One of Brady's core philosophies is pliability, in which he avoids traditional weight-lifting to keep his muscles soft and loose.
• Brady is also a strict eater, avoiding sugars, some fats, alcohol (most of the time), and even certain types of vegetables.
• Brady's strict lifestyle isn't for everyone, and some scientists disagree with his philosophies, but it's clearly working for him.

Tom Brady seems to have found the Fountain of Youth.

At 41 years old, in his 19th season, Brady is preparing to play in another Super Bowl, the ninth of his career and fourth in five years.

Brady credits his longevity to his regimented lifestyle.

In recent years, Brady has shed light on his diet, exercise and recovery habits, and overall lifestyle in the form of a book, "The TB12 Method," a cook book, apparel, and documentary. He has created the regimen and business with his friend, business partner, and trainer, Alex Guerrero, who Brady cites as an influential figure in his life.

But how exactly does Brady employ the TB12 method to get results in his day-to-day life? 

Learn more about one of the strictest lifestyles in sports below.

Sam Belden contributed to this report.

At 41, Tom Brady is the oldest starting quarterback in the NFL, and still one of the best.

In a 19-season career, he has won five Super Bowl rings and has been named to 14 Pro Bowls, including the past 10 years.

But staying at the top of your game for nearly 20 years isn't easy — in fact, Brady is a bit of a fanatic when it comes to his physical fitness.

See Also:

• WHERE ARE THEY NOW? The 6 quarterbacks taken before Tom Brady in the 2000 NFL Draft
• The world was a lot different the first time Tom Brady won a Super Bowl
• WHERE ARE THEY NOW? Tom Brady's teammates on his first Super Bowl team