Carve out just nine minutes a day, five to six times a week, and watch how your core transforms.
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According to experts, it takes just four core workouts to absolutely rip your top half to shreds, so you can get stronger.
If you’re looking for an advanced ab workout, consider this viral, intense workout from teen TikTok influencer Demetra Dias. With over 4 million followers on her main profile (@demetradias) and over 1 ...