It-girl and Reebok brand ambassador Gigi Hadid was put to the test as she held a plank while being grilled by her trainer. Gotham Gym’s Rob Piela shows no mercy as he instructs Hadid to hold the grueling endurance movement while answering questions on what motives and inspires her. Hadid smiles through the pain as she shares that calling your mother is the best way to stay positive and that encouraging human kindness is a passion project for her