ok, so the other day i was in a horseshow. my mom video taped me riding so i could see what i looked like and how my form was. im a really good equitation rider at the walk and trot but when it comes to cantering.....my arms pump!!! how can i stop this?? i ride 1 or 2 times a week so im thinking im not used to working these muscles a lot....please help!! haha ok so please no haters or mean people!! thanks!!!