Jennifer Aniston Swears by These 7 Habits to Stay Fit at 55

She Maintains a High Protein Diet

"My nutrition is very much the same. It's usually a lot of high protein, vegetables, salads, soups,” she tells People. “I do 80/20. I give myself days where I can have whatever I want. I don’t deprive myself,” she added to TODAY. Why should you consider amping up your protein intake? According to clinical trials, consuming more protein than the recommended dietary allowance not only reduces body weight (BW) but also enhances body composition by decreasing fat mass while preserving fat-free mass (FFM) in both low-calorie and standard-calorie diets.

She Cheats on Occasion

Jennifer allows herself to indulge in “everything I would possibly want on a weekend,” she told People. Her cheat meal “depends,” she says. “I mean, dare I sound repetitive, but Mexican food is a real favorite of mine. It's not even that much of a cheat, to be honest. Or a cheeseburger or pizza or pasta — all that stuff.”

RELATED: Olivia B. Flowers Flaunts Fit Physique in "Christmas in Cana"

She Tries to Get Enough Sleep

“My bigger challenge is sleep. I think that’s all part of our nutritional hygiene — the amount of water we get as well as the amount of sleep we get. It’s the combination of all of those things that make your workouts the most effective," she told TODAY.

She Exercises in the Morning

She Exercises in the Morning

She Does P.Volve Workouts

“I’ve become gentler with myself,” she says of her approach to fitness, which has “definitely evolved” over the years. “I find that I can be gentler on my body and still get the benefits of a great workout,” she told Prevention. She specifically loves P.Volve workouts, a functional fitness that helps you “function throughout the day” and “work out your essential muscle groups to keep your body strong,” she says. “So you can live a long, healthy, strong life.”

She Hydrates

Aniston prioritizes hydration, drinking a whopping 100 ounces of water per day. "But occasionally I just have to have a Diet Coke—there's nothing like it!" According to the Mayo Clinic, hydration is essential for various reasons. Water helps eliminate waste through urination, perspiration, and bowel movements, keeps your temperature regular, lubricates and cushions joints, and helps protect sensitive tissues.

She Does Pilates, Spinning, Elliptical, and Running Workouts

“I had an injury last fall and I was only able to do Pilates, which I absolutely love. But I was missing that kind of sweat when you just go for it,” she recently told InStyle. “I'm going back to my 15-15-15, which is a 15-minute spin, elliptical, run. And then just old school: I can chase myself around a gym. I need some kind of movement, even if it's just 10 minutes a day on a trampoline.”