Science Of Trampling

OK peeps, when you trample a girl, you hear her groan and moan.  But it's more interesting if you know exactly what belly muscles she uses to hold your weight.  Here's a video that I found explaining the various muscles of your abdomen.  Now you know which muscles she is using to hold up your entire weight! 

NOTE how the same muscles that are clenched when you trample her are also used for breathing -- that's why she can't breath when you're standing on her belly!  If she breathes, then you sink into her gut .... *painful*.