Plank - 30 Day Challenge

Plank - 30 Day Challenge is a Chrome extension that helps you commit to a 30-day plank program. It features a daily countdown of your plank time, a log of achievement days, and a count-up mode once you reach 30 days.

It also provides an approximate energy estimate (METs, weight, duration) and kcal, supports optional permissions like Apple Health data recording, tracking for personalized ads, and notifications, and is available in Japanese and English.