Kim Kardashian works out on the beach in Miami on October 3, 2012. Credit: Mandatory Credit:

With just weeks to go until her 32nd birthday, Kim Kardashian is determined to look good as she turns a year older.

In Florida to film her E! spinoff Kourtney and Kim Take Miami, Kardashian hit a local beach on Wednesday to fit in a workout in the sand. Doing a set of lunges with careful form, Kardashian showed off her curves in a body-hugging black tank top and leggings. The star -- who pulled back her hair into a sleek ponytail -- wore black wide-rimmed glasses as she worked out.

"You have to really know your body. Everyone has a body part that they don't like and want to conceal, and something that they like and want to show off. So it's all about knowing what you want to show," Kardashian -- no stranger to rocking curve-hugging bikinis -- recently told Prestige Hong Kong.

Serving as a spokeswoman for diet supplement QuickTrim, Kardashian -- who famously lost 10 pounds in 10 days ahead of a family vacation in March -- says she has put more of a focus on fitness in 2012.

"No more sitting at home, eating too much!" Kanye West's girlfriend told Us Weekly earlier this year. "I'm on a mission . . . Now is the best time to get in shape."