Carrie Underwood is indulging in some rest and relaxation – in her swimsuit! The country star shows off her incredible figure while taking some downtime in one of her latest social media posts. "Day off laziness," she captioned one of her Instagram Stories. She also revealed that she is indulging in carbs on her day off. "Don't worry, I still made bread," she added in another photo of a freshly baked loaf. How does the 39-year-old keep herself fit? Read on to see 7 ways Carrie Underwood 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 Bathing Suit Photos!

Carrie is so seriously devoted that she has her own workout clothing line and a fitness app, Fit52, that she developed with her trainer, Eve Overland. "I want to be healthy and fit 52 weeks of the year, but that doesn't mean I have to be perfect every day," she told Women's Health. "This philosophy is a year-round, common-sense approach to health and fitness that involves doing your best most of the time." 

Carrie avoids doind the same workout over and over."I want to listen to my body and do what I'm in the mood for. On different days, that means different things," she told  Shape. She even switches up her routine by the weather. "I'm a bit of a seasonal workout person. If you think about it, in the winter, we're all bundled up, and we all want to be warm, comfortable, there are a lot of holidays. So, I'll lift more and do less cardio then and make use of all those extra holiday food calories and build some muscle. In the summer, I want to feel lighter. I want to run and sweat, so I use the temperature and that feeling to lean up a bit and do more outdoor cardio things."

Carrie doesn't make excuses when it comes to exercise and is "an expert at working out with nothing," she told Shape.  "You can do sit-ups anywhere. You can be in your hotel room, and you don't have to leave. You just have to think outside the box, and get creative." She even brings her ab wheel with her while traveling, "and it doesn't weigh a lot or take up a lot of space," she points out. "It can be painful, but you don't have to do many of them to feel it the next day. I like keeping it simple."

"I want to be stronger. If I feel good in my clothes, and I'm starting to see some muscles, it just makes me want to keep going," Carrie confessed Shape. "I like seeing muscles and feeling progress, so I'm always looking to lift more or do more reps."

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Carrie doesn't stick to a set exercise schedule. "I exercise when I can. Sometimes I'll do it seven days in a row; other times it's only twice a week. I take the opportunity when I have it, knowing that some weeks I won't be able to exercise as much, because I am not the 5 a.m. workout type," she told InStyle. "I'm a midmorning-workout person. But I weave fitness into my day. I always take the stairs, which firms your legs, and at home I'll do lunges as I go from one room to the next. No one is judging you in your own house, so why not make chores active? I turn it into a game, like if I'm picking up my kids' toys off the floor, I'll do a squat each time I lower myself down. These little moves keep up my energy, especially on days when I can't get in a full workout."

Carrie is a counter, keeping track of her eating. "I keep my macro numbers — which is your calories, carbs, and protein intake — in check," she revealed to InStyle. 

Carrie is a "wannabe vegan" and long-time vegetarian. She told Women's Health that she starts her day with a tofu or egg-white scramble (with eggs from her own chickens), Ezekiel toast, berries, and coffee. Lunch is usually a "veggie-packed" vegan sandwich—like Tofurky, tomato, avocado, red onion, spinach, and mustard followed by a protein bar in the afternoon. For dinner, she enjoys roasted veggies and a piece of vegan chicken, or a tofu stir-fry.