Carrie Underwood is in incredible shape after welcoming two children into the world with husband Mike Fisher.

And the country singer showed off her stunning figure in the April issue of Women's Health magazine, which hits newsstands March 17. Inside, the American Idol vet revealed that her slim frame just comes down to discipline. 

'I love rules. This is how I feel good about myself, and this is how I operate,' said the 36-year-old performer. 'Physical fitness makes everything else possible.'

Ready to pose: Carrie Underwood is in incredible shape after welcoming two children into the world with husband Mike Fisher.

Rules work: 'I love rules. This is how I feel good about myself, and this is how I operate,' said the 36-year-old performer. 'Physical fitness makes everything else possible'

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Carrie Underwood is pictured showing off her enviable physique on the cover of this month's Women's Health Magazine.

We are sure you'll agree that the singer looks phenomenal in this Cynthia Rowley swimsuit! Embracing the colour-block trend, this number has a scoop neckline, low back and high-cut leg, adorned with panels of contrasting colours.

The best news is this swimsuit is available to buy at Farfetch in two similar colourways (click right). But if you would rather shop around first, scroll down to discover punchy picks from New Look, Boden, Swim Society and celebrity favourite, Oseree.

Underwood works out as often as she can: 'If I can work out seven days a week – which doesn't happen, but if I can – I'm going to. Because the next week, I might get two days,' said the Cry Ugly crooner.

She also has a certain flow for when she visits the gym. And if she is not prepared, it goes wrong: 'When I walk in and don't have a plan, I usually walk out.

When on the treadmill, she psychs herself out. 

'I have to set goals for myself: "Every 15 minutes I'm going to hit 1.25 miles, then by the end of an hour I'll have run 5 miles."'

Gym queen: Underwood works ut as often as she can: 'If I can work out seven days a week – which doesn't happen, but if I can – I'm going to. Because the next week, I might get two days,' said the Cry Ugly crooner

'That's a part of my personality I need to be better with. I'd love to sit in a bubble bath, but that's not going to happen. My self-care is my gym time, and that's a stress reliever for me.'

But she was not always body confident.

After she was shamed for her body on American Idol in 2005, she dieted.

'I shouldn't care what other people think about me…I was tired, and I kept buying bigger clothes. I knew I could be better for myself, and I let my haters be my motivators,' she confessed.

She worked out and counted calories and the benefits were immediate.

'I was sleeping better, and I had more energy for our grueling schedule.'

But when she got down to 800 calories per day she lost her way.

It's all formula: She also has a certain flow for when she visits the gym. And if she is not prepared, it goes wrong: 'When I walk in and don't have a plan, I usually walk out'

Mostly mental: When on the treadmill, she psychs herself out. 'I have to set goals for myself: "Every 15 minutes I'm going to hit 1.25 miles, then by the end of an hour I'll have run 5 miles"'

'I would "fall off the wagon," then feel terrible and repeat the cycle. Your body is screaming I need more calories. I need more carbs!' she admitted. 

Now she is on track, however, but does indulge once in a while.

'I do have my vice, and it's red wine. It's good for my heart, right?!' laughed the songbird.

Keep moving: As far as getting Zen, she would rather get moving. 'That's a part of my personality I need to be better with. I'd love to sit in a bubble bath, but that's not going to happen. My self-care is my gym time, and that's a stress reliever for me'