I know this question has probably been asked a million times already.

But I just cannot seem do figure out how to do a thrust, without it looking like a jump or without it looking stiff as hell. (pun intended)
Or without looking like a wind chime, dangling back and forth.

Like I can think of how a thrust would work, you lean your hips/legs back and then go forward while your torso goes back.
But Models usually only have points for the legs and torso, as there is not one between them, in the area of the pelvis.

So how do yall do it?
Im still kinda new to Source Filmaker, and so any help would be appreciated. (Including general tips for SFM Animators, if you have any.)