Expandable climbing panel and climbing wall having such a panel

A climbing wall comprising:

• an expandable climbing panel comprising
• an outer element, the outer element comprising a climbing panel supported by a frame, the frame comprising a first track element;
• and
• an inner element, the inner element comprising a climbing panel supported by a frame, the frame comprising a second track element,
• the first and second track elements being configured to slide relative to one another such that the climbing panel of the inner element slides behind the climbing panel of the outer element;
• wherein one of the inner element and the outer element is hingedly attached to a first wall portion;
• wherein the other one of the inner element and the outer element is hingedly attached to a second wall portion;
• wherein the first wall portion comprises an actuator that is operable to change an angle of the first wall portion with respect to a vertical axis;
• and
• wherein:
• (i) changing the angle of the first wall portion in one direction causes the inner element to slide away from the outer element, increasing an area of the climbing panel of the inner element that is exposed to a user;
• and
• (ii) changing the angle of the first wall portion in an opposite direction causes the inner element to slide behind the outer element, decreasing the area of the climbing panel of the inner element that is exposed to a user.