The 15-Minute Standing Abs Workout Plan: Ten Simple Core Exercises to Firm, Tone, and Tighten Your Midsection: Roberts, Dale L.: 9781098690618: Amazon.com: Books
6 standing ab workouts that work your core
5 Ways To Work Your Core While Standing - Fitbit Blog
4 Standing Abs Exercises That Will Sculpt Your Core From Every Angle | SELF
5 Ways to Work Your Abs While Standing - wikiHow Fitness
30 Minute Standing Abs Workout to Tone and Tighten Your Belly - YouTube