A vibrant cartoon with colours and smooth animation. A bright, cheerful 3D-animated kids' Short in a soft pastel playroom with a rainbow-colored rug and a few floating balloons. Three original characters: a round-faced toddler in a yellow t-shirt, a toddler in a green overalls outfit, and a small, friendly puppy. Big expressive eyes, rosy cheeks, smooth rounded shapes, saturated colors, soft studio lighting, gentle depth of field, high-quality children's animation style. Camera: fixed, medium-wide shot, characters centered and facing the camera. No cuts, no camera movement, so the loop feels seamless. Action, in time with a bouncy 100 BPM beat: 0-2s: The characters pop into frame with a small bounce and smile. 2-6s: They point to their knees and bend and bounce them, four times, perfectly in sync. A small sparkle appears on each knee on every beat. 6-10s: They tap their knees alternately (left, right, left, right) while the puppy copies the move with its back legs. 10-13s: They spin once and clap on the beat. 13-15s: They freeze in the starting pose and smile. The last frame matches the first frame so the video loops smoothly. Audio: upbeat toddler-friendly pop with a xylophone, ukulele and soft claps. Cheerful child-like vocals sing a simple 4-line chorus: "Knees, knees, bend and bounce, bounce, bounce! Knees, knees, tap them left and right! Spin around and clap, clap, clap, Knees, knees, bounce all night!" On-screen text at the top, large and rounded: "Learn Your Knees!" with a small knee emoji.