McCormack's early athletic career began in primary school where he participated in many team sports. He joined the school's soccer and rugby teams. McCormack's high school years were spent at Kirrawee High School in Sydney, where McCormack continued his sporting endeavours winning several distinguished sporting awards including the NSW Sporting Blue for the best athlete in the state. McCormack finished 5th in 1989 and 7th in 1990 at the Australian Schools cross country titles but was pushed by his parents to focus on education over sport. After graduating in the top 10% of the State, McCormack decided to further his studies completing a Bachelor of Economics degree at the University of New South Wales.
Triathlon career
McCormack raced his first triathlon while attending university. His success was sound and after winning two Australian Junior Triathlon titles. He raced his first Junior Triathlon World Championships in Manchester England, in August 1993 finishing in 4th place. His premature celebrations down the finishing chute cost him the silver medal in the race, allowing him to be passed by two competitors.
ITU racing
McCormack graduated from university in October 1995. After a short stint working in finance, in 1996 he flew to Europe to race triathlons internationally. Racing for the Tricastan Triathlon Team out of France he had immediate success winning 9 events on his first season abroad, including the World Cup race in Drummondville, Canada, his first race as an elite racer in ITU racing. McCormack finished his first year as a professional ranked number 9 in the World by the ITU. In 1997, he recorded six top 10 finishes in World Cup racing as well as some dominating performances on the tough French Grand Prix racing circuit. He finished the year ranked number one, winning both the 1997 ITU Triathlon World Championships and the 1997 ITU Triathlon World Cup, the first male triathlete ever to win both titles in the same year. McCormack became the first man in history to ever win the ITU World Championships, The ITU World Cup series and be ranked number 1 in the World in a single season. McCormack would be ranked ITU World number 1 for more than 26 months in total. McCormack was left off the Australia Olympic Team for the 2000 Sydney Olympics despite being the highest Australian on the world rankings. He left Australia for the USA, moving away from the ITU World Cup racing and into the U.S. racing scene. McCormack would remain undefeated in the USA for 3 years and 33 consecutive triathlon races. He won the 2001 Goodwill Games race against the top 30 athletes in the world and made clear his disapproval of Australian selector's decisions to leave him off the Olympic Team, dominating short course triathlon racing in 2000, 2001 and 2002. He was picked for the Australian Team to represent at the Commonwealth Games in England in 2002, and won 3 Triathlete of the Year awards for his racing during this period. Before moving to Ironman distance races McCormack won almost every major short course title on the global triathlon calendar including the ITU World Cup Series, Escape From Alcatraz Triathlon, Mrs T's Chicago International Triathlon, San Diego International Triathlon, New York City International Triathlon and LA International Triathlon. He also became the first triathlete in a decade to capture the US Triple Crown. In 2001, McCormack was again crowned Global Triathlete Of The Year and Competitor Of The Year and became the only triathlete ever to hold the USA Professional Championship Title and the USA Sprint Course Title in one season.
In 2002, Macca shifted his focus to Ironman racing. He won Ironman Australia on debut in 2002 and then defended that title in 2003, winning again in 2004, 2005 and 2006 to beat the previous consecutive win record set by Pauli Kiuru. Macca's first race at the distance in Europe in 2003 eventuated in one of the sport's greatest races in Roth, Germany, where Macca was beaten in a sprint finish by Lothar Leder. Macca won the event eventually in 2004, followed by 2005, 2006, and 2007. He went under 8 hours at Challenge Roth in 2004, becoming the first non-European to do so. He did so again in 2005 and 2007. In 2008, McCormack broke the 8-hour mark at Ironman in Frankfurt, becoming the first man to go under 8 hours on two different courses. At the 2002 Ironman World Championships at Hawaii, McCormack failed to finish the race on his first attempt. He finished in 2003 in 9:32:11, placing 59th. In 2004, he again failed to finish and abandoned into a race vehicle driven by six-time World Champion Mark Allen, who counseled Macca to race fewer iron-distance races during the year. In 2005, he was able to finish 6th with the fastest run split of the day. The next year, in 2006, McCormack finished Hawaii in second place. After Normann Stadler completed a new course record bike time of 4:18 McCormack started the run some 10 minutes down. After running a 2:46 marathon time he was just 71 seconds behind Normann Stadler at the finish but he had given it absolutely everything he had. McCormack became Ironman World Champion in 2007, with a winning time of 8:15:34, including a 2:42 marathon in very hot conditions. McCormack again won the 2010 Ironman World Championship, defeating two-time defending champion, Craig Alexander.
Olympic qualifying
Following his 2010 Ironman World Championship, McCormack focused his 2011 season on qualifying for Australia's2012 Olympic team in triathlon. He stated, "it's the one thing in my career I regret, not making an Olympics." In his eight ITU points races, in pursuit of fulfilling his Olympic goal, McCormack's finishes placed him in the range of 26th to 34th place along with 3 DNFs. Despite this, McCormack was still thought to be a potential selection to the Olympic team when taking into account the performance of other fellow Australian triathletes. Ultimately Triathlon Australia and the Australian Olympic Committee did not select him for the three man Olympic team. McCormack expressed his frustrations about the vague and ambiguous selection process for the Olympic team by Triathlon Australia, but stated that the team that was selected was worthy. The Australian federation suggested an attempt at the 2012 ITU Long Distance Triathlon World Championships. It was a title only one other Australian male had ever won: Greg Welch, almost 20 years prior. The event was held in Vitoria-Gasteiz, Spain in July, involving a 4km swim, 120km bike ride and a 30km run. While he struggled a little with the length of the bike ride, McCormack’s run was one of the most powerful delivered over the distance, clocking 1 hour and 40 minutes to win his fourth world title and become the sport’s oldest world champion.
Post-racing business endeavors
After 20 years, McCormack retired from professional triathlon to focus on his growing business interests in the sports consulting, media and high performance development space. He is the CEO and co-founder of MANA Sports and Entertainment Group, whose projects and clientele include the Super League Triathlon, and the Royal Family of Bahrain; whose owned sporting entities including World ProTour Cycling Team Bahrain McLaren and the Bahrain Endurance 13.
Super League Triathlon
was founded by McCormack and entrepreneurs Michael Dhulst and Leonid Boguslavsky. Founded in 2017, Super League Triathlon is a triathlon racing series that takes place around the world across several formats that are variations on triathlon's traditional swim-bike-run to test speed, versatility, and endurance. Over the course of a qualifying and championship series, the top male and female triathletes from around the world race for the crown as Super League Triathlon champion.
Bahrain Endurance 13
McCormack has served as a consultant at the operational level with the royal family of Bahrain for steering their Bahrain Endurance vision for His Highness Sheikh Nasser Bin Hamad Al Khalifa. As the managing director for Bahrain Endurance 13 and sports advisor, McCormack acts as primary spokesperson for the endurance team and strategic advisor for optimizing the team’s performances globally and attaining the marketing exposure that the Kingdom of Bahrain is focused on achieving.
MX Endurance
In 2012, McCormack launched an online training platform and community. Relaunched as MX Endurance under new management in 2017, it aims to connect age group and professional athletes from all over the world and give them access to a global network of resources and experts so they can become better at endurance sport.
Bollox Energy Gel
McCormack co-created a line of energy gels business offering a no-frills, affordable source of energy on-the-go, delivered to the athlete's doorstep. The product is packaged in a bright yellow wrapper and available in one flavor, cherry.