A device (1) for exercising reaction to stimuli (200), said device (1) comprising a proximity sensor (10), adapted to detect presence (100) in a proximal sensing range (11) of said proximity sensor (10)； CHARACTERIZED IN THAT: said device (1) further comprises: - two or more indicators (20), each indicator (20) being configured to generate a respective stimulus (200) indicative for a respective direction (300)； and - a controller (21) configured to instruct one of said two of more indicators (20) to generate said respective stimulus (200) for said respective direction (300) upon detection of said presence (100).
