HeelInFix on each foot. after this: interpStyleLocked 0 add this in: valueOpDeltaAdd Figure 1 lFoot:1 xrot deltaAddDelta 0.030000 (rFoot:1 for the right) and it will set automatically when you bend the foot (JCM) Of course you better pay attention to which is Figure 1 (cross-talk) But burning Figure 1 with a Null works. (it follows its own rotation in any case)