リハサク is a self-exercise support app designed to assist users in finding the most suitable exercise methods for their symptoms. It offers a goal management feature to help users maintain motivation for exercise. Users can share their daily pain status with their assigned therapist and track their exercise performance and progress easily. Additionally, the app provides a chat function to communicate with therapists at the facility, depending on the usage method at the facility.

The app aims to normalize rehabilitation and promote a healthier society by encouraging users to actively engage in their own rehabilitation process, in addition to receiving passive treatments from therapists.