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?

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

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How to do GHD Sit-Ups on the Glute Ham Developer That Will Maximize Ab Strength

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If you are experiencing low back issues, tight glutes, or a tight piri