Captain of the Canadian rhythmic gymnastics team, Cossar was faced with homophobia from coaches and judges throughout her career. This is also why she took a long time before to come out.
If judges don't like you you get worse marks, Cossar told in an interview with Outsports.
However, after years, Cossar felt less and less comfortable.
"What's the point of representing your country if you can't represent yourself in a true way? I felt guilty for not representing myself as a person for who I truly was. I felt I wasn't doing myself any good, hiding my true self," she says.
Four years ago, she has begun the process of coming out, step by step, starting with her teammates. And even if her coach had trouble understanding her, she has not lost her place in the team, and was able to continue her passion and go to the 2012 Olympics, where, as captain, she finished 11th.
Now retired from her sport, Cossar is on a mission to improve the environment in sports for LGBT people. She also works in collaboration with the Canadian Olympic Committee in their LGBT inclusion initiatives.
"It's a huge passion of mine now because I know it can be really difficult and really confusing for people who don't know what resources are out there, or if you think you're the only one in your sport. You feel really alone.
Photo from Olympic.ca