More like sexercise: Model cranks up heat with seriously provocative workout

EVERYONE knows that it's important to stretch and warm up your muscles before exercise.

   LIMBERING UP: There are definitely more effective positions to stretch your groin than 

   this

But Mary Carey's way of getting limber probably isn't best suited to a public place.

The Celebrity Rehab star set pulses racing in Studio City Park, California, with a series of positions that would be better suited to the bedroom.

   NO LEGGINGS?: Hot pants probably weren't the best choice

It probably doesn't help that the blonde bombshell opted to wear tiny, booty-hugging hot pants and a low-cut vest for the session.

Oh, and a designer handbag, because who needs dumbbells?

   PULLING POWER: And we're not talking muscles

After showing off her downward dog (that's a yoga position for the record), the babe crawled around in the grass before spreading her legs form some texting fun.

Yep, Mary was happy to just chill with her phone whle bending her flexible bod into a series of increasingly suggestive shapes.

   TEXT APPEAL: That's one way to break up a workout

Between the bending over, groin stretches that seem to place style over substance and lack of sports bra, it's almost like fitness isn't the only thing on this hottie's agenda.

After this, it's certainly not muscles she's going to be pulling.