An indoor sports complex with lead walls as well as squash, badminton and a sauna. Impulsiv is probably the best lead climbing wall in the Basel area, located just over the border in Germany. As well as three rooms with excellent routes for leading, it has a separate (limited) bouldering wall, and many top rope problems, good for beginners. The wall is well maintained, reaches a height of 17m and the routes are regularly changed. There are roughly 100 lead routes to suit ability up to 8a.