The present invention relates to a support post (2) comprising at least two tubes (4, 6) telescopically in sliding connection to each other. A locking device (8) holds the tubes in a locked state and allowing relative sliding of the tubes in an unlocked state. At least one end (10) of the support post has an opening (12; 112) in connection with a surface support element (14; 114). A spring is arranged within the opening of the support post to act on the surface support element (14; 114), to resiliently affect the surface support element (14; 114) in a direction away from the open end (10) of the support post and vice versa. The locking device (8) comprises a locking ring loosely arranged on one of the tubes (4) and further comprises a first ring holding arm arranged at one end of the other tube (6); the first ring holding arm having a first recess for retaining the locking ring in loose arrangement around said tube (4) with limited movability. A lever is in engagement with the spring and arranged in a first position in an unstressed condition of the spring. The lever is arranged in a second position in a stressed condition of the spring. By moving the lever from the first position to the second position, and vice versa, resiliently affect the surface support element (14; 114) in a direction to and from the open end (10) of the support post (2). The surface support element is arranged to be installed on a floor, and the lever is a pedal.