Abstract: In some examples, a ski bike includes a frame, a steering mechanism rotatably coupled to the frame, a ski, and a ski retention system. The ski retention system rotatably couples the ski to the frame or the steering mechanism. The ski retention system includes a ski bracket and a fixed member. The ski bracket is rigidly coupled to the ski. The fixed member is rigidly coupled to the frame or the steering mechanism and rotatably coupled to the ski bracket.

Abstract: In some examples, a ski bike includes a frame, a steering mechanism rotatably coupled to the frame, a ski, and a ski retention system. The ski retention system rotatably couples the ski to the frame or the steering mechanism. The ski retention system includes a ski bracket and a fixed member. The ski bracket is rigidly coupled to the ski. The fixed member is rigidly coupled to the frame or the steering mechanism and rotatably coupled to the ski bracket.

Abstract: A spine relaxing device includes a base and a support column vertically supported on the base. An adjustable main support member, an adjustable head support member and an adjustable foot support member are mounted on the support column. The head and foot members are movable relative to each other support member. A hand operated control device can be operated by the user to move the position of the head support member and the foot support member relative to the main support member. The main support member and head support member are adjustable in width.