The present invention relates to a system (10) for supporting a user to do a set of exercises, the system comprises a first subsystem (11) for providing audio/video content associated with said set of exercises and a second subsystem (12) for supporting the user's body when the user does said set of exercises. The invention proposes a device (100) for controlling the system and the method thereof. The device (100) comprises a first unit (101) for acquiring previously determined data (310) comprising at least one of information relating to said set of exercises and characteristics of said user, a second unit (102) for adjusting a parameter of said first subsystem (11) according to said data (310) and a third unit (103) for adjusting a parameter of said second subsystem (12) according to said data (310). With the help of the controlling device (100), parameters of the system (10) can be adjusted automatically without interaction with the user.