The fish can be fought with or without a game-chair. With a game-chair, the angler sits in a specially designed chair at the stern of the boat, and places the butt of the rod into a gimbaled mount. Most rods used in this manner are quite long. The older and more classic models had straight rod butts. More contemporary models have bent rod butts, which give a more convenient angle for fighting the fish when the rod is placed in the mount. With large fish, this can still represent a considerable challenge, but "stand-up" game fishing, without the assistance of a chair and with the seat mount replaced by a harness, requires a good deal of strength and endurance, as well as body mass.