The five hurdles form an obstacle that can be overcome in several ways. If you do not mind getting dirty you can 'belly crawl' underneath them. Otherwise, you go over the hurdles by walking or running. A single hurdle can also be used for exercises on the spot such as push-ups and high jumps. The Robinia bars are made from de-barked and sap-free Robinia trunks in various dimensions. Robinia is a native European wood species with high strength and natural durability in various climatic conditions. KOMPAN uses wood from FSC-certified sources.