Here's Alessandra Ambrosio doing some downward dog ... and upward WOW!!!

The supermodel slipped her slender frame into some yoga pants and a matching pink top, showing off her flexible body ... and the photos will make your jaw drop.

Looks while Alessandra did some meditation too ... only she can make deep thought a must-see moment for the rest of us.

We gotta say ... Alessandra is still smoking hot as she goes through her mid-40s ... friendly reminder that age is just a number.

Check out the gallery to see all the sexy snaps! Once you're done pickin' your jaws off the floor, can you track down the words below?