Strengthen your core with “Jack Knifes “

Uncategorized Mar 27, 2020

Here’s some inspiration to add to your core routine! Jack Knifes that activate both the upper & lower abs! Depending on your fitness level do;

10-30 reputations x 3 

Jack Knifes are a great 3rd exercise going into your core work out once you’re properly warm around your lower back & core!


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