my friend has a sister who's 9 and she barely knows how to ride... but since shes the baby of the family, she's spoiled she has a horse anyway, good thing her horse is such a saint! anyway, she rides her horse maybe once a month and grooms her maybe once a hear, yet she brags how amazing her horse is,,,,,, Enough of getting off topic. her horse is skin and bones, but she doesn't need fat, she needs muscle. me and my friend have permission from her mom to exercise the horse while the little sister is inside. we have been riding her every single day, and she hasn't got one ounce of muscle put on her! Got any tips on what we can do to give her some muscle???