This is a revised PAPAI (Personal Adapted Physical Activity Instructor) handbook 2020, part of the Sport Empowers Disabled Youth 2 (SEDY2) project. The original handbook of the PAPAI project, based on Finnish pilot-phase experiences, was written in 2016 by Aija Saari and Heidi Skantz. This revised (2020) PAPAI handbook contains updated materials and lessons learned by the Finnish Paralympic Committee and Inholland University during 2017-2020.