Jessica's workout routine incorporates CrossFit, a strength and conditioning program that combines weightlifting, sprinting and body-weight exercises done at high intensity.
Alba's CrossFit coach is fitness expert Yumi Lee. Lee is married to CrossFit athlete Ron Mathews, who trains Joe Manganiello. Manganiello maintains his ripped physique with the low-carb Paleo diet and CrossFit, as does Jessica Biel.
Country superstar Tim McGraw also credits CrossFit and the Paleo diet for his unbelievable 40-pound weight loss and rippling eight-pack abs at age 47.
The Paleo diet is the most popular diet around today, and has a large celebrity following, including Megan Fox, Jessica Biel, Robin Wright, and Kellan Lutz. Research suggests the Paleo diet accelerates weight loss without calorie restriction, reduces blood pressure, and prevents cancer, diabetes, heart disease, depression, and even Alzheimer's.
A recent study published in the European Journal of Clinical Nutrition indicates the Paleo diet is twice as effective as other diets for promoting weight loss and reducing belly fat.
Study: CrossFit Boosts Metabolism, Burns Belly Fat
CrossFit has recently come under fire for its link to repetitive stress injuries, but fitness experts like "The Biggest Loser" star say injuries are avoidable if you use proper technique.
While many people think CrossFit is only for people who are already in shape, Harper said the program can help even morbidly overweight people slim down and tone up.
"I'm working with people who are 500 pounds and doing Crossfit on a regular basis," Bob told Reuters. "Crossfit just completely makes sense [as long as] you work at your level doing the things you can do with proper coaching."
A recent study at Ohio State University confirms what CrossFit fans have said all along — the high-intensity power training workouts can dramatically improve aerobic fitness and body-fat composition.
According to the 10-week OSU study, male and female participants who did CrossFit, a strength and conditioning program that combines weightlifting, sprinting and body-weight exercises done at high intensity, achieved significant improvements in aerobic capacity and body fat.
The study tracked 54 participants who did weight-lifting moves such as the squat, dead lift and overhead press performed at high intensity with extremely short rest intervals in between sets. The research showed that all of the participants improved their aerobic fitness, decreased body fat and gained lean muscle.