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Carrie Underwood is celebrating her fur babies! The country star showed off her amazing body in a swimsuit, as well as her adorable pooch, on Wednesday via Instagram. "It's #NationalPuppyDay ! My babies might be all grown up now (even got one in diapers), but they'll always be puppies in my heart! Be extra sweet to those furry family members today," she captioned a series of snaps. How does the 39-year-old keep herself fit? Read on to see 7 of Carrie Underwood's top tips for staying 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!

1 Work Out Like It's Your Job

Carrie takes exercise very seriously, to the point that she has made it her job. She recently developed her own app, Fit52 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 explained to 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." In addition to helping with diet, the app has lots of workouts demonstrated by the singer herself.

2 Seasonally Switch Up Your Workouts

Some people eat seasonally, but Carrie works out that way. "I want to listen to my body and do what I'm in the mood for. On different days, that means different things. 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," she explained to Shape . "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." df44d9eab23ea271ddde7545ae2c09ec

Carrie is "an expert at working out with nothing," she bragged to 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." One way she does this is by bringing an 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."

Carrie isn't trying to be skinny. "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," she told Shape. "I like seeing muscles and feeling progress, so I'm always looking to lift more or do more reps."

5 Slip in Workouts When You Can

"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 explained to 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."

Carryie stays "looking lean and muscular" by 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, a long time vegetarian, describes herself as a "wannabe vegan," she told Women's Health . For breakfast, she might eat 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.