Petra is practicing new method of returning serve. They do not go to details about what kind of return it is except that it is usually used by male tennnis players. Petra adds that some women also can do it and that she has already tried it before but had some troubles with rhythm that's needed for that kind of return. (Does anybody have a clue what kind of return they might be talking about?)
What sort of return of serve is that
unless if Petra has suddenly decided to return in chip/slice like Federer consistently does at times on opponent's second serves to deny them the first offensive strike in the exchange. Also on first serves too at times --
Or, probably related to the split step before contact (?) -- certain guys in ATP tennis have a split step forward
to close on the ball and cut the trajectories (0:08, 0:15 etc. on the Youtube video), I can't think of any other player other than Murray or/and Federer who does that consistently though -- Nalbandian does it but it varies and theirs even Federer's isn't as comprehensive as Murray's.
Girls in the WTA have a tendency to just hop on place (Venus, Ana, Victoria, Radwanska...) and (like Julia)/or have a timid little hop forward (Serena, Maria, Li, Stosur, Cibulkova...), some have almost none (like Wozniacki), Petra she has 2 or 3 hops on place -- that's the assumptions we can have if she talks about timing etc. -- if it's related to the technique on return iDK and I really doubt this changes from ATP to WTA.