@madonna / Instagram 1 / 8
@madonna / Instagram 1 / 8

No pain, no gain! Despite a recent foot injury, Madonna hit the gym on Jan. 16. The 55-year-old pop legend shared a photo on Instagram of herself working out while on crutches.

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"Inventing a new workout on crutches!" the "Superstar" singer wrote. "Waking up new Neuro transmitters is always fun! #nothingcanstopme." In the snapshot, Madonna leans on her crutches while doing a high kick with her one of her legs.

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How did the Material Girl get injured? Dancing, naturally! "She bruised a bone in her foot from dancing in her high heels," her rep explained to The New York Post's Page Six. "She'll be fine and off crutches in a week."

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But the fitness enthusiast -- who co-founded Hard Candy Fitness in Berlin, Mexico City, Rome and Toronto -- doesn't appear to be taking any time off to recover. On Thursday, she was spotted hobbling down a New York sidewalk on crutches while heading to her morning workout.

The mother of four, flashing a slight smile to photographers, dressed warm for the winter weather by wearing a fur hat, coat, black sweatpants and sneakers.

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