Professor Thierry Troosters (ISI H-index 76) is a physiotherapist and professor of Rehabilitation Sciences. He obtained his PhD in 1999 under the guidance of his mentors Prof Rik Gosselink and Prof Marc Decramer. Currently Thierry heads the department of Rehabilitation Sciences at the KU Leuven (Leuven, Belgium). Prof Troosters has been the president of the European Respiratory Society in 2019- 2020, he is a member of the GOLD science committe and serves on the Federal Council of Physiotherapy in Belgium. Along with the Respiratory Division at the University Hospitals in Leuven, he investigates the devastating non-respiratory consequences of lung diseases, often induced by physical inactivity or exacerbations. With his group he is looking at optimizing and modernizing exercise training strategies for patients with lung disease and he explores strategies to measure and enhance physical activity. His group attempts to increase the proportion of responders to exercise and physical activity interventions by understanding the mechanisms of action of these interventions and adapting interventions to individuals with lung diseases. With their group they pioneered on investigating the impact of physical inactivity patients with COPD and other respiratory conditions including cystic fibrosis and lung transplantation. Thierry has been the PI of the IMI project PROactive and was the COPD and KU Leuven lead in the IMI project Mobilise-D. Clinical studies are conducted together with Prof Wim Janssens Prof Daniel Langer and Prof Stephanie Everaerts at UZ Leuven often in collaboration with Prof Heleen Demeyer of the University of Ghent.