Kate Middleton Shows Off Flat Midriff at First Sports Event Since Pregnancy [PHOTOS]

Kate Middleton showed off an impressively flat midriff as she reignited her love for physical activity at a sports workshop at the Copper Box Arena in Queen Elizabeth Olympic Park, London.

The Duchess of Cambridge was at the SportsAid Athlete Workshop, her first sporting engagement since giving birth to Prince George, the third in line to the British throne, in July.

SportsAid, of which the Catherine is a royal patron, is a charity organisation that recognises the achievements of the next generation of British athletes and helps them compete at international sporting events. The workshop was Kate's first visit to the organisation as its patron.

During the workshop, the duchess joined more than 70 athletes, including several Olympians and Paralympians such as Katherine Grainger, Ade Adepitan and Karen Pickering. Kate watched them taking part in a number of sports activities, including wheelchair basketball, CP football, volleyball, fencing and badminton.

Heads turned when Middleton gave volleyball a go.

Wearing a striped T-shirt, navy blazer and blue jeans, a toned-looking Kate took to the court without changing out of her suede navy wedges.

According to the organisers, the duchess played several rallies with a group of the organisation's athletes that included England men's volleyball squad member, Jordan Dalrymple.

Middleton has played such games at her official engagements in the past. During a visit to her old school in Pangbourne, Berkshire, in 2012, the duchess famously joined children for a game of hockey, probably her favourite sport, while wearing high heels.

See photos of Kate playing volleyball here.