The invention refers to the equipment of the training rink for floorball, manufacturing of exerciser structural element, applying concept of tennis racket stringing. Proposed design of subsidiary element for floorball rink arrangement characterized with that it is made as latticework formed by: two parallel end plates; several threaded rods as stiffening members; two elastic string structures disposed in two parallel planes, at that each of it presents one side of mentioned latticework and provided with: holes for fastening threaded rods which assure rigidity and load bearing capacity of the subsidiary element frame structure; holes for criss-cross stringing in two parallel planes and string fastening at mentioned end plates independently one from another.