Breathing is the key to sculpting your abs, says personal trainer, The Independent

You have to couple it with intense abdominal workouts 

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Fierce Abs: Your Jump Start Guide to Sculpt, Tighten, & Tone Your Abs: Kiernan, Jessica: 9781482566468: : Books

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Why Rowing is the Best Cross Training Activity - Triathlon Newbies

This Exercise Is Seriously Efficient At Sculpting The Abs In Less Time

COVID-19: Reflections and Lessons, Palantir

This is why you shouldn't neglect the rowing machine in your gym