Victoria Beckham is the first to admit she is "very, very disciplined" when it comes to her diet and keeping in shape.SEE: Inside David and Victoria Beckham's amazing home gymThe fashion designer displayed the results of her hard work on Friday, showing off her sculpted figure in skintight sportswear in a gruelling workout video that saw her performing pull-ups on a TRX machine.WATCH: Victoria Beckham highlights sculpted figure in gruelling workout videoVictoria's toned arms and back muscles