Happy Birthday, Rihanna! How the Singer Stays So Fit

Happy birthday, Rihanna! The singer turns 26 today, and to celebrate the milestone, we're taking a look at how she stays fit.

She fits it in: Rihanna worked with trainer Ary Nunez for years, bringing her wherever she traveled on tour to make sure she couldn't slack off with her workouts. Ary was on call with exercises that were a mix of martial arts, dancing, and calisthenics, no matter what the time. "We train when she's ready . . . even if we're on the road and it's 2 a.m. in the morning. I'm on call 24/7 with her," Ary said about training Rihanna in 2012.

She steps it up: While training for her role as a hard-core military officer in the movie Battleship, the star didn't shy away from intense bootcamp classes. Rihanna worked out alongside real-life Navy officers with push-ups, drills, and weighted sandbags to help get into shape — and into a tough military mindset — for the movie.

She loves cardio: When Rihanna wants to slim down, she ups her cardio, saying in 2008 that she uses it to keep her legs from bulking up. Now, when she's not traveling, Rihanna bumps up her cardio to 30 minutes five days a week (from her usual three-day-a-week routine), says trainer Harley Pasternak. Her favorite cardio workouts include the stationary bike, cycling, jogging in place, jumping jacks, and jump roping.

She complements everything with a healthy diet: "If I exercise every day for a week, I can drop several pounds. If I diet, I see even faster results," Rihanna has said of eating right. Harley says the singer sticks to a diet of five small meals a day.

She's got the right goals: Staying fit isn't just for now; Rihanna knows that it's the key to a healthy future. "I want health and happiness in five years. I want to be healthy and happy," she told Elle UK in 2013.