Chris Hemsworth celebrates his 40th birthday by'sweating off the birthday cake'.

Chris Hemsworth knows how to throw a knockout punch.

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The Thor actor celebrated his 40th birthday with a flurry of events, including a boxing practice session the day after.

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In an Instagram video, a shirtless Hemsworth is seen sparring with a training partner in an indoor and outdoor gym.

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As the two men fought, Hemsworth immediately fired a few jabs to his partner's gloves.

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The August 15 video was captioned, "Sweating off the birthday cake with @Centr."

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Hemsworth did consume a lot of birthday cake on August 11, when he took an Instagram photo with two chocolate confections topped with Happy Birthday candles.

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"Thank you so much for all of the birthday wishes!" he added. "Yet another lap around the sun and I'm still going strong!"

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"I can safely say that not a single piece of cake survived the night."

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Blac Chyna is dedicated to her exercise program and wellness journey.

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