Participants in which sporting pastime might call themselves Mamils?

Cyclists! The team MAMIL is an acronym meaning "middle-aged men in Lycra." For those who don't know, Lycra is the tight-fitting fabric that bikers wear. Now it is important to realize the MAMILs are not actually professional cyclists despite having all the best gear like a professional. The actual professionals would never call themselves a MAMIL. The recreational cyclists who are MAMIL have all kinds of skill levels from wealthy beginners, to enthusiasts.

MAMIL, is a new documentary out of Australia, offers a fresh perspective by introducing us to the everyday dads (and other men) who happen to be cycling diehards. In the process, it examines masculinity and male bonding in the context of the sport and shows why people may come together to proudly embrace the label.

"We know we look bloody stupid," one interviewee says in the film's trailer. "We're just weekend warriors trying to set our own best times and challenge each other."

https://www.bicycling.com/news/a20028755/new-documentary-explores-what-it-means-to-be-a-mamil/