She's a hugely sought after supermodel. But Jourdan Dunn took time out of Week for family duties on Monday, attending the launch of the all-new KOBOX City studio in London with her fitness trainer brother Antoine Dunn. The British model, 26, showed off her incredibly taut figure as she showed her support for her sibling. Dressed in a tiny Nike sports bra Jourdan showcased her incredibly toned abs and minuscule waist. Making the most of her lean figure, she teamed it with a pair of fitted khaki leggings, showcasing her long lithe legs. And adding a cap and trainers, she engaged in a fun workout session, letting out any frustrations of LFW on the nearby punching bag.