Ryusei Imai became an internet sensation when YouTube videos of his martial arts videos inspired by Bruce Lee went viral in 2016. With over millions of views on his videos, Ryusei's finally has an instagram account and a following of 160k followers. 

Here are some shocking photos of how fit and quickly he's growing up!

This little Bruce Lee fan is so fit and dedicated to his idol's art. Here's one of him with the famous nunchucks:

Ryusei smiles for the camera despite the rainy day backdrop:

I can't get over how fit and toned this little boy is:

Kids grow up so fast don't they? You can check out more of Ryusei's progress and cute videos on his instagram account: @ryusei416.