Indoor Climbing is an increasingly popular form of rock climbing performed on artificial structures that attempt to mimic the experience of real rock climbing but in a more controlled enviroment.

The first indoor walls tended to be made primarily of brick leaving little scope for interesting routes as the steepness of the wall and variety of the hand holds were somewhat limited.

The most common construction method involves screwing resin hand holds on to wooden boards. The boards can be of varying height & steepness (from completely horizontal 'roofs' to not even vertical 'slabs') and have a large variety of holds (from very small 'crimpers' to huge 'jugs') attached. This variety, coupled with the ability for the climbs to be changed by attaching the holds onto the wall differently has resulted in indoor climbing becoming a very successful sport.