universee_decode on Instagram: "The post shares a 37-second split-screen video of BMX races, juxtaposing riders pedaling fully against those relying on momentum and pumping, showing near-identical speeds despite minimal leg input. Pumping in BMX converts terrain undulations into kinetic energy by shifting body weight—compressing on descents and extending on ascents—allowing speed gains without pedaling, a technique detailed in tutorials like Joy of Bike's 2024 YouTube guide on non-pedaling accel