I joined the British Army as a Guardsman infantryman in the Coldstream Guards. Over the next twelve years I was stationed at Catterick, Windsor, Aldershot and Tidworth, and qualified as a Physical Training Instructor (PTI).
As a PTI, I led active soldiers through structured physical training three times a week. Running. Assault courses. Agility work. Conditioning. Mental resilience training. The job was to keep fighting soldiers fit, fast, and ready, in conditions that didn't care whether you had the right kit or not.
I learned two things in those years that still shape Gymletics. The first is that physical performance is mostly built in unglamorous, repetitive work, not in moments of inspiration. The second is that the gear you wear during that work either supports it or gets in the way. There is no neutral.