▁stay ▁tight ▁in ▁the ▁s addle ▁so ▁that ▁br ush ▁cannot ▁be ▁caught ▁between ▁his ▁or ▁her ▁leg ▁and ▁the ▁f ence . ▁ ▁C off in ▁ ▁Also ▁called ▁the ▁rails - d itch - rails , ▁the ▁coff in ▁is ▁a ▁combination ▁f ence ▁where ▁the ▁horse ▁j umps ▁a ▁set ▁of ▁rails , ▁moves ▁one ▁or ▁several ▁str ides ▁down hill ▁to ▁a ▁d itch , ▁then ▁goes ▁back ▁u ph ill ▁to ▁another ▁jump . ▁ ▁In ▁the ▁past , ▁coff ins ▁were ▁more ▁pron ounced , ▁with ▁up ▁and ▁down ▁banks ▁leading ▁to ▁the ▁d itch ▁in ▁the ▁middle . ▁However , ▁today ▁only ▁the ▁former ▁type ▁with ▁the ▁rails ▁is ▁seen . ▁The ▁coff in ▁is ▁intended ▁to ▁be ▁jump ed ▁in ▁a ▁slow , ▁imp uls ive ▁can ter ▁( known ▁to ▁event ers ▁as ▁a ▁" co ff in ▁can ter " ▁for ▁that ▁reason ). ▁This ▁can ter ▁gives ▁the ▁horse ▁the ▁power ▁and ▁ag ility ▁to ▁negoti ate ▁the ▁obst acle , ▁and ▁also ▁allows ▁him ▁the ▁time ▁needed ▁to ▁assess ▁what ▁question ▁is ▁being ▁asked , ▁so ▁that ▁he ▁may ▁better ▁complete ▁the ▁combination ▁without ▁problem . ▁Appro aching ▁in ▁a ▁fast , ▁flat ▁gal lop ▁will ▁cause ▁miss ▁str iding ▁and ▁may ▁ent ice ▁a ▁ref us al ▁from ▁the ▁horse . ▁Go ing ▁too ▁fast ▁may ▁also ▁result ▁in ▁a ▁fall , ▁if ▁the ▁horse ▁cannot ▁phys ically ▁make ▁a ▁st ride ▁between ▁the ▁obst acles . ▁ ▁Com bin