The REACH partners DTU, Copenhagen University, and Lyngby conduct a feasibility study comprising 10 citizens over 8 weeks who engage in two sessions of playful exercise each week. The study will examine the variations in physical/functional ability over time accompanying exercise (e.g. are they exhausted after exercise and move less than normal for some time?) as well as the correlation between armband sensor (Fitbit) and body and thigh-worn sensor patches.