noun
posting trot
Equestrian term for a rising trot where the rider rises from the saddle in rhythm with the horse's stride.
乗馬クラブで軽速歩の練習をした。
I practiced the posting trot at the riding club.
Compound of 軽 (light) + 速歩 (trot, literally 'fast walk'), referring to the lighter, rising style of trotting.