It's Brazilian jazz. I know that much. Not much in the way of vocalization, just a guy singing something like "o-bahia-ayo-oba-oba-oba" intermittently.

It is in a nike commercial...
and maybe it is bossa nova and not jazz (just a blind guess)

anyway I hope this helps you to find out the song

Mas que Nada? It has been done by many different artists. You could start with Jorge Ben.

ooh! i've been wanting to know the name of this song for ages! i've heard it in so many different instances - films, commercials, just music around me, and i never had any way of checking the name.

thanks so much, dj! you're a lifesaver.