ine ▁physical ▁ther apy . ▁ ▁Cav ale tt i ▁were ▁invent ed ▁by ▁Feder ico ▁Cap r illi ▁and ▁designed ▁to ▁help ▁a ▁horse ▁improve ▁its ▁balance , ▁adjust ▁its ▁length ▁of ▁st ride , ▁and ▁to ▁lo osen ▁and ▁strength en ▁its ▁mus cles . ▁They ▁are ▁ ▁often ▁used ▁in ▁sets ▁of ▁at ▁least ▁four ▁to ▁six ▁placed ▁in ▁a ▁row , ▁but ▁have ▁nearly ▁un limited ▁ways ▁they ▁can ▁be ▁configured . ▁ ▁U sed ▁at ▁their ▁lowest ▁pla cement ▁as ▁ground ▁rails ▁or ▁at ▁a ▁level ▁no ▁more ▁than ▁about ▁ ▁high , ▁they ▁can ▁be ▁set ▁to ▁encou rage ▁a ▁proper ▁length ▁of ▁st ride . ▁ ▁By ▁being ▁set ▁closer ▁or ▁farther ▁apart ▁than ▁a ▁horse ' s ▁natural ▁st ride , ▁they ▁encou rage ▁length ening ▁or ▁short ening ▁of ▁the ▁st ride . ▁ ▁U sed ▁as ▁a ▁" g ymn astic " ▁in ▁conj unction ▁with ▁other ▁horse ▁jump ing ▁obst acles ▁in ▁a ▁training ▁ring , ▁they ▁help ▁teach ▁the ▁horse ▁how ▁to ▁approach ▁a ▁f ence ▁at ▁the ▁proper ▁rate ▁of ▁speed ▁and ▁length ▁of ▁st ride . ▁ ▁Set ▁at ▁higher ▁settings , ▁they ▁become ▁small ▁j umps ▁to ▁introduce ▁young ▁horses ▁or ▁beginning ▁rid ers ▁to ▁jump ing . ▁ ▁Some ▁designs ▁can ▁safely ▁be ▁stack ed , ▁allowing ▁f ences ▁up ▁to ▁about ▁. ▁▁ ▁Sp ac ed ▁as ▁ground ▁rails ▁between ▁ ▁apart , ▁cav ale tt i ▁encou rage ▁a ▁horse ▁maintain ▁a ▁shorter ▁st ride