ティナ・ルイーズさんのインスタグラム写真 - (ティナ・ルイーズInstagram)「One of my favorite ways to stay fit is doing stair runs. -Stair running is a plyometric exercise, meaning the muscles exert maximum force in short intervals of time, causing the muscles to extend and contract in a rapid or "explosive" manner. Running up stairs also forces you to work against gravity, building strength and power. 💪🏼 Wearing my fav @1stphorm bike shorts, which are the perfect length for exercising in this hot weather! 🤜🏼 #iam1stphorm」7月18日 9時11分