Instagram: : @missdollycastro
Followers: 5 million

Fitness model Castro has her own line of athletic apparel and accessories, Bars & Branches -- not to mention Instagram's best abs.

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Instagram: : @karrueche
Followers: 6.1 million

Ever since the African American/Vietnamese stunner dropped Chris Brown like a hot potato, she's had a lot more time to steam up the world's Instagram feeds.

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Instagram: : @kylieeerae
Followers: 1.4 million

This tatted bikini model is fitspiration meets inkspiration.

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Instagram: : reneesomerfield
Followers: 1.5 million

Somerfield isn't just a swimsuit model, she's also a dog lover. Lock up your boyfriends.

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Instagram: : sierraaaskyee
Followers: 1.2 million

Now that we've seen Sierra Skye's willowy bod, we'll have what she's having.

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