This Barbie can really hold a plank. Well, at least the actress who plays her sure can. According to the Barbie movie's trainer David Higgins, Margot Robbie can hold a plank for four minutes and ten ...

David Higgins trained the cast of 'Barbie' and each workout started with core exercises. This engages the abdominal muscles and help you get the best from your workout. Higgins had the cast build ...