For useful feedback in physiotherapy interventions for geriatric rehabilitation, we have designed and tested two prototypes, based on commercially available radio frequency tags. The prototypes were designed to be suitable for a population with limited proprioceptive skills, high dependency rate, and limited cognitive skills. Focus for design was on designing feedback that would allow the inpatients to self-monitor their rehabilitation process, and would make for increasing their proprioceptive skills. The system is also intended to mean a source of motivation for rehabilitation practice. We have performed a first explorative study in a real setting. In this paper we will be commenting on initial observations of the use of one of the prototypes.