Who am I?

I am really good at boxing - I can knock out people - I am Brazilian

I am really good at skateboarding - I can do skateboard tricks - I am Brazilian

I am Argentinian - I can dribble the ball - I am really good at soccer

I am really good at gymnastics - I can do acrobatic performances - I am American

I am really good at swimming - I am American - I can swim very fast

I am really good at basketball - I am American - I can dribble the ball