The One Move You Need To Tighten Your Tummy Muscles

The One Move You Need To Tighten Your Tummy Muscles

One of the favourite moves prescribed by Kayla Itsines and group fitness instructors everywhere, the straight-legged jackknife or V-up, as it’s also referred to, is a great way to tighten tummy muscles, but this move is not for everyone. “The V-up is a very difficult...

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