Things I built, and why.

RinkUp on the App Store ↗athlitix.com ↗

The hard parts

• A jump lasts under 0.7 seconds. The skater opens, pulls tight, and lands — and nobody at the boards can honestly tell you whether that was three rotations or an optimistic two and a half.
• Practice ice is crowded. Twenty skaters, near-identical dress, and exactly one of them is yours.
• Mid-air, pose confidence collapses. A tracker left to its own judgement will cheerfully switch to whoever is standing in the background.
• Ice has no markings. No pitch lines, no stadium geometry, no reference frame to calibrate against — so the measurements come out of a physics model instead.