Plank - 30 Day Challenge is an iPhone application developed by INTERSECT KK in the Lifestyle category, specifically under Health & Fitness. The program's main feature is to support a 30-day Plank challenge by counting Plank seconds daily. Users can track their progress, manage achievement days, and even continue with a Plank count-up mode after completing the 30-day challenge.

The app also provides an Active Energy feature that calculates energy expenditure based on factors like METs, weight, and exercise duration. Additionally, Plank - 30 Day Challenge offers optional permission requests for Apple Health integration, personalized ad delivery based on tracking, and sending notifications to users. It is available in Japanese and English languages for a diverse user base.