WATCH: Djokovic works out with help from son

Novak Djokovic understands the importance of a strong core, so much so that he has even combined his exercises with quality father-son time. The 12-time Grand Slam champion is famous for his athletic moves on court, and a strong core is critical for his game.

His son Stefan recently turned three, and is clearly getting more and more acclimated to everyday life as a pro player's child.

Djokovic has needed to incorporate another family member into his daily routine as he and his wife Jelena welcomed daughter Tara in September.

The Serbian is set to make his return to the ATP tour in Doha.