Cristiano Ronaldo is one of the fittest footballers around, but the Real Madrid superstar wants to make his son Cristiano Jr. as fit as him. 

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Ronaldo shared a video on his Facebook page where his son holds his dad's feet, while the footballer fired a round of sit-ups. 

Ronaldo Jr. followed orders obediently from his dad, as the 4 year old fired 10 crunches during his brief workout session.

After completing it the football star hoisted his son in the air, and complemented him as a champion while hugging him tight.

Derrick Rose, PGA player Bubba Watson, Chris Paul, Ryan Fitzpatrick and Blake Griffin were the other sports superstars who have had workout sessions along with their sons.