I did a GHD sit-up every day for a week — here's what happened to my abs
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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?
If you have weak hip flexors or spend long hours sitting at a desk, th
Get deeper into your sit ups 😮💨 ⏬ What is a GHD machine ? ⏬ A Glut
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