Dr. Kaye Cleave on Instagram: "🙏 Thanks @iandgunther and @daniellaaramirezz for this sit up challenge 🔥 If you have a strong core this challenge isn’t impossible. In fact, on the original video many people said they found it easy. Other comments included, “it has nothing to do with strength, just center of mass” and “simple physics, if your upper body is heavier than your lower body, even abs of steel won’t help you. Most strength trained women can do this because their lower body is heavier,

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