I did a GHD sit-up every day for a week — here's what happened to my abs

What is a GHD sit-up, how do you do a GHD sit-up, and what happens if you do them every day for a week?

The Best GHD Sit Up Variations - The Barbell Physio

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Ghd Sit Up

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I did 100 sit-ups every day for a month and this is what happened

How to Use the GHD Machine, Plus the Best GHD Machine Exercises