Former director of the Dutch Calisthenics Union (NLCB.nl) and certified Calisthenics coach trained by the Calisthenics Educational Institute (hetcoi.nl), with 10+ years of experience. Professional Calisthenics coach and trained and licensed physiotherapist with 10+ years of physiotherapy and Calisthenics experience. The app works well, but it is still in active development with regular updates occurring.