1don MSN
This 9-minute ab workout uses one piece of equipment to build a stronger, more functional core
Carve out just nine minutes a day, five to six times a week, and watch how your core transforms.
Jeff Cavaliere, C.S.C.S., is updating his viral YouTube "perfect workouts" series and just shared his go-to science-based back workout. His perfect science-based back workout consists of not one ...
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