AoM, 5BX.

Brett & Kate McKay, “5BX: The Cold War Military Workout for Getting Fit in 11 Minutes a Day,” The Art of Manliness (blog), March 19, 2024, https://www.artofmanliness.com/health-fitness/5bx-the-cold-war-military-workout-for-getting-fit-in-11-minutes-a-day/.