Proposed is a mat-type exercise device. The mat-type exercise device may include a plurality of wheel modules. Each of the plurality of wheel modules is installed in the device body such that the wheel module can move between a protrusion position at which the wheel module protrudes from the lower surface of the device body and an introduction position at which the wheel module is introduced to the inside of the lower surface of the device body. Additionally, a plurality of switching modules switches the position of at least one of the plurality of wheel modules between the protrusion position and the introduction position. Accordingly, the mat-type exercise device is secured to move horizontally when the wheel module is located at the protrusion position, and stable exercise is secured when the wheel module is located at the introduction position.

Maneuverable ergonomic trailer stands are disclosed. An example portable trailer stand includes: an elongate upper ledge, a post coupled to the upper ledge, an extendible leg telescopically coupled to the post, the upper ledge being vertically movable to selectively engage and disengage an underside of a trailer based on movement of the extendible leg relative to the post, and a plurality of wheels coupled to the post, the post to maintain the plurality of wheels at a substantially fixed distance from the upper ledge as the upper ledge is vertically moved, each of the plurality of wheels to be equidistant from a vertical axis traversing through a center of the upper ledge.