Even though CrossFit was created about 20 years ago the momentum is just now in full swing. Popularity for CrossFit and its timed interval style training is taking the fitness world by storm.

People can’t get enough of the cardio, weight lifting, plyometrics, bodyweight, and kettlebell exercises. Celebrities are totally catching on in a big way.

Check out the top female Celebrities who use CrossFit in a big way to add lean muscle, shape up, and stay fit.

1. Jessica Alba

Semi-Exclusive... 51057651 Jessica Alba looks happy, healthy and hot while vacationing with husband Cash Warren and friends in St Barts on April 4, 2013. The mother of two showed off her amazing body and perky posterior in a cute mismatched bikini as she swam in the warm ocean waters and tanned herself on one of the resort's floating buoys. She and Cash were affectionate and cuddly as they relaxed before playfully splashing about in the water. NO WEB USE FameFlynet, Inc - Beverly Hills, CA, USA - +1 (818) 307-4813 RESTRICTIONS APPLY: NO GERMANY,NO ITALY,NO FRANCE,NO SPAIN

Jessica used CrossFit trainer Yumi Lee to help her bounce back after the birth of her daughter Haven in 2012.