The term "core" often refers to a variety of muscles around the centre of your body: 'TVA' (transverse abdominis), rectus abdominis, obliques, pelvic muscles, and even the muscles of your lower back,' ...

C) When you feel a contraction in your abdominal muscles, return to the start position. A) Start standing on two feet. Place one foot into the TRX, laces facing the floor. B) Balance on one foot ...

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