Thieves broke into a changing room locker and stole a swimmer's keys before driving off in her sports car.
The woman watched the theft through the windows of the new Pavilions in the Park leisure centre in Horsham.
She saw two boys unlocking her Nissan Skyline before speeding off from the car park.
Her handbag containing £70 and a cheque book was also taken.
One of the boys was described as fat and wearing a cap. The other was blond and wore a blue top.
The registration of the stolen vehicle is 732 4RU.
Police have only just released details of the incident, which happened on April 17 at 3.30pm.
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