Serena Williams posted an Instagram photo, showing off the athletic physique that’s helped make her a world-renowned tennis star.

She’d slid into a skimpy neon yellow bikini that offered a generous view of her cleavage, as well as of the 42-year-old’s enviably sculpted abs.

One of her muscled arms pushed her hair from her face, and she placed another on her waist, her navel piercing glinting beneath the lights in the snapshot.

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In her caption, the sister of fellow tennis legend Venus Williams vamped that she’d uploaded the eye-catching Instagram photo ‘Just because.’