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
The 15 Best Standing Ab Exercises You Can Do While Watching Netflix - PureWow
I tried this standing abs workout with 30 million views — here's what happened | Tom's Guide
5 Ways to Work Your Abs While Standing - wikiHow Fitness