The Knight's First Day at the Gym — Armor Cardio

A 10-second earnest gym-bro parody, 9:16 vertical: Sir Duncan's first day at the gym — leg day as battle training. The hook: "THIS IS BUT A BRISK MARCH," shouted at full sprint on a treadmill.
0-3s: A modern gym, 6 a.m., EDM thumping, harsh fluorescents. Sir Duncan arrives in full armor, sword racked over his shoulder like a gym bag. He warms up by swinging his sword in great arcs — and the yoga class evacuates, mats and all. He nods, satisfied with the cleared space.
3-6s: On the treadmill in sabatons, Duncan sets it to a full sprint — and keeps pace effortlessly, armor clanking in rhythm, shouting, "THIS IS BUT A BRISK MARCH." The camera side-tracks with him: the display climbing, his stride unbroken, fellow runners staring. He increases the incline. For honor.
6-10s: At the smoothie bar, Duncan arm-wrestles the trainer for a free shake — and wins, the trainer's arm hitting the counter as the barista slides the shake across. He declares the gym his new training grounds; the staff, laughing, makes him an honorary member plaque. He hangs it beside his sword. Earnest gym-bro glory. End.
Craft: Sir Duncan — full armor, sabatons, sword, total sincerity; the trainer as the worthy opponent; the evacuating yoga class; the plaque as the trophy. Camera: sports-montage cuts, a treadmill side-tracking shot, an arm-wrestle close-up. Lighting: harsh gym fluorescents, neon accents, armor glinting. Atmosphere: earnest gym-bro parody — chivalry meets cardio. Style: training montage, 24fps, 10 seconds, 9:16 vertical.