As the team captain for rhythmic gymnastics in Canada, Rosie led her team to Canada’s first ever Olympic berth in Rhythmic Gymnastics. To this day, Rosie’s team is the only Canadian rhythmic gymnastics team to have competed at an Olympic Games, in the group competition.
Cossar was also a member of the 2011 Pan Am Games team that won three medals that year in Guadalajara, Mexico.
After her subsequent retirement from the sport, Cossar has been very active in her support for the LGBTQ+ community and now dedicates her time to spreading messages of inclusion, specifically in regards to LGBTQ+ athletes in sport.
Over the last 3 years, Rosie has held the position of Sport Inclusion Consultant for the Canadian Olympic Committee. In this role, Rosie manages more than 60 Team Canada athletes across the country who are ambassadors for creating more inclusive spaces in sport. In recognition of the work Rosie has been doing in this space, she was graciously awarded the title of “2017 Youth Role Model of the Year”, by the Canadian Centre for Gender and Sexual Diversity.
Rosie is currently a student at the University of Toronto Scarborough where she studies Paramedicine and serves as the chair of the Women in Sport Subcommittee.