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Cristiano Ronaldo has some competition - and it's not just from opponents on the football field.

The Real Madrid winger was surpassed in speed by his four-year-old son Cristiano Jr when they performed a workout routine together.

In a heartwarming video clip, the 30-year-old conceded to his mini-me who quickly completed a set of sit-ups, proclaiming: 'You're the champion!