Leg at frame 181 appears normal.15 Play the animation. The biped’s back foot stays on the footstep and the
leg stretches out as the biped descends to the lower set of footsteps.
For extra credit, add a scale controller to the green thigh, and stretch that
leg out, roughly between frames 161 and 171.16 Save your work as mystretchy_leg.max, or open stretchyleg_final.max for
comparison.Once you have controllers added to the biped body parts you can animate
their parameters, or animate their weights. Here's an example that shows
animation of parameters.
Using Controllers with Biped | 831