January Jones Shows Off Fit Figure In Vintage-Inspired Swimsuit 

January Jones is channeling her Mad Men character Betty Draper! On Monday, the 43-year-old actress rocked a vintage inspired swimsuit on social media, showing off her strong-is-sexy body. “Going Grey Gardens,” she captioned the snap of herself, rocking a green Shani Shemer Swimwear swimsuit featuring a plunging neckline, tie waist, and puffy sleeves. How does the actress and mother keep herself so fit? Read on to see 7 ways January Jones stays in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bikini Photos!

1. She Started Working Out After Becoming a Mom

January was never a fan of exercise. However, after becoming a mom she needed to because of her declining posture. “After I had my son, Xander, I wanted to feel strong because my body had changed so much. As he got bigger and I was hauling around a 20- or 30-pound toddler, my lower back gave out and I saw my shoulders starting to curl and hunch. I wanted to do something for my posture and core strength,” she told Shape.

2. Pilates Is Her Go-To Workout

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She started taking barre classes and then private Pilates. “Then a friend told me about Lagree Pilates,” she told Shape. “I’ve been doing it two to four times a week for the past year now, and I’ve gained weight because I’ve put on muscle. I’ve gone up a size in clothes, but I feel like I look better naked.” While she admits it is “quite difficult” she has found that it’s the only thing that makes her feel stronger, “and I’m loving it,” she said.

3. Group Classes Motivate Her

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January prefers the energy of group classes over personal training sessions. “The music is good and there’s always a different routine, so it doesn’t get boring. There are 10 of us in the class, and I like having women on both sides of me to push me,” she told Shape. “When I did the private Pilates lessons a couple of years ago, I just saw myself getting lazy with it because there wasn’t that drive for competition. For me, that’s what’s motivating. If there’s someone strong next to me, I definitely want to up my game. I find myself looking forward to it more than I’ve ever looked forward to a workout.”

4. Her Diet Is All About Moderation

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“I don’t deprive myself of anything. If I want something—steak, a bagel—I’ll eat it. There’s no diet or strict set of rules,” she told Shape about her diet. She also starts eating later in the morning. “I don’t get hungry until around 10 a.m., but since I usually do Lagree at 9:30, I’ll make myself eat a banana beforehand so I don’t get too shaky. Then I have a MacroBar afterward and eat lunch around 11:30—usually salad, soup, or a sandwich,” she revealed. “I love to cook for my son and me. For dinner, we like salmon with french fries, and we make pasta frequently. We try to have lots of green veggies."

5. She Drinks Celery Juice Daily

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January is a huge fan of a trendy green drink. “Last winter, I started drinking celery juice every day, and I’ve seen amazing results in my energy, digestion, and skin and how I sleep. I have that in the morning, then I take my vitamins and drink coffee,” she told Shape.

6. She Eats Organic

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January eats organic, “because I worry a lot about that for my kid,” she explained to Shape. “No antibiotics or hormones in meats is really important to me, and so is eating sustainable fish. I don’t want to be that annoying person in the restaurant who’s like, ‘Where’s this fish from?’ But I do it anyway.”

7. She Focuses On Strength and Longevity

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For January, staying in shape is about strength, not being skinny. "Being strong is important as you get older. I want to look and feel as young as I possibly can." "Your body fat percentage will increase over time if you don't do anything to replace the lean muscle you lose over time. Strength training can help you preserve and enhance your muscle mass at any age," says the Mayo Clinic. "Strength training may also help you:

• Develop strong bones. By stressing your bones, strength training can increase bone density and reduce the risk of osteoporosis.
• Manage your weight. Strength training can help you manage or lose weight, and it can increase your metabolism to help you burn more calories.
• Enhance your quality of life. Strength training may enhance your quality of life and improve your ability to do everyday activities. Strength training can also protect your joints from injury. Building muscle also can contribute to better balance and may reduce your risk of falls. This can help you maintain independence as you age."