Always the active mother,  Heidi Klum was spotted taking her three kids to a martial arts center in Los Angeles yesterday afternoon (September 22).

The “Project Runway” hottie, who is very pregnant with her fourth child” looked a bit worn out as she escorted Henry, Johan, and Leni to their lessons amidst a sea of paparazzi.

And with her soon-to-be-born due any day now, Heidi says she never ceases to be amazed at the capabilities of the human body.

“The last month is unbelievable, how rapidly your stomach goes. It’s huge! The thighs, the butt – everything explodes in the end. It’s bizarre. Just as it’s a miracle that you can grow a human being in your belly, it’s a miracle that your body goes back to normal again. I don’t think you ever get back to exactly the way you were, but you do get close. And I’m happy with that – especially when you see your kid for the first time.”