I usually adjust the ab, waist and hip dials. Someone has a great, Morphing with Magnets from RDNA, tut that also shows how to do a, hmmm, fall-off, thing so you don't get bony projections on hips or abs when using mags. I'm still trying to learn the magnet morphing thing so I can't tell you how it works. :(

Let me introduce you to my multiple personalities. :)
     BluEcho...Faery_Light...Faery_Souls.