For most people, staying at home right now means a lot of sitting and staring at screens. Katrien de Bock, Professor of Exercise and Health, tries to stay active together with her family. Because every movement counts – especially for older people. This can also be a waltz in the living room. Studies clearly show that exercise not only strengthens the immune system, it also builds healthy muscle mass, which in turn helps us in case of illness. Unfortunately, you lose muscle mass much faster than you build it up!