Contrast: Sauna & Plunge Log

Contrast times your sauna, hot bath and cold plunge rounds — and the rest in between — so you can see exactly how long you spent where, and how your heart responded. WITH AN APPLE WATCH • On an Apple Watch Ultra or Series 10 (any watch with a water temperature sensor), getting into water starts a round on its own. Cold or hot is read from the temperature. • Heart rate for every round, with the average, min and max. • Water temperature live on your wrist, and time in each temperature range. • Water Lock comes on when you get in, so splashes don't tap the screen. • Other Apple Watch models work too: pick each round by hand. • Walk off without tapping End and the session closes itself after a long rest, timed from when you actually stopped. ON YOUR IPHONE • A calendar of your sessions — day, week or month — with each day as a ring split into hot, cold and rest. • Per-session breakdown:…