has been flipping
-ha estado volteando
Presente perfecto progresivo para el sujeto he/she del verbo flip.

flip

Apart from the different places, Julius has been flipping and ollie-ing, there are also tons of tricks he is testing out.
Aparte de los distintos lugares en los que ha estado bordando flips y ollies, hay montones de trucos que está probando.
Palabra del día
el pavo