MacLennan made her international debut in 2005, representing Canada. Her most memorable sporting achievements include competing in front of a home crowd at the 2015 Pan American Games in Toronto and being chosen as Canada's flag bearer for the 2016 Rio Olympics opening ceremony.

She became the first Canadian gymnast to win an Olympic gold medal in trampolining at the 2012 London Olympics. She defended her title at the 2016 Rio Olympics, becoming the first Canadian athlete to do so at the summer Games and the first Canadian woman to win two gold medals in an individual event at the summer Games.

Injuries and Challenges

Throughout her career, MacLennan faced several injuries. She sustained a severe lower leg sprain and two torn ligaments before the 2020 Olympics but recovered in time to compete. In 2019, she broke her ankle at a World Cup event in Minsk. A neck injury ruled her out of the 2017 World Championships in Sofia.

In July 2015, she suffered a concussion three weeks before the Pan American Games and another head injury in August that year. Despite these challenges, she resumed training in November 2015.

Personal Life and Education

MacLennan resides in Toronto with her partner Nick. She is a public speaker and student, fluent in English. She holds degrees in Health Studies and Physical Education from the University of Toronto. Between 2012 and 2018, she pursued a master's degree in kinesiology and exercise science at the same university.

In 2021, she began studying for a master's degree in business administration at Stanford University. Her hobbies include dancing, wakeboarding, skiing, and snowboarding.

Retirement and Future Plans

MacLennan announced her retirement from competition in December 2022. She expressed her desire to continue contributing to sport governance, accountability, and ensuring athletes are heard. She aims to encourage more girls to stay in sport and pursue professional careers.

Other Roles and Activities

MacLennan was elected as the International Gymnastics Federation Athletes' Commission representative for trampoline gymnastics from 2022 to 2025. She has served as chair of the Canadian Olympic Committee Athletes' Commission and been on the advisory board of Right To Play.

She learned about Right To Play during high school and got involved during her first international competition in South Africa at age 11. Her experiences there sparked an interest in international development.

Awards and Honours

MacLennan was named Female Athlete of the Year at the 2012 Canadian Sports Awards. She received the Syl Apps Award from the Ontario Sports Hall of Fame that same year. As Canada's flag bearer for the Rio Olympics opening ceremony, she added another accolade to her impressive list of honours.

Influences and Philosophy

The most influential person in MacLennan's career has been Karen Cockburn. Her heroes include her grandfather Lorne Patterson, who was a gymnast set to compete in the 1940 Olympics before they were cancelled due to World War II. Other idols include Canadian ice hockey player Hayley Wickenheiser.

MacLennan's sporting philosophy is: "Focus on what you can control, have faith in what you don't." This mindset has guided her through numerous challenges and successes throughout her career.

As Rosie MacLennan transitions into new roles within sports governance and advocacy, her legacy as one of Canada's most accomplished trampolinists remains firmly established.