(possibly?) Ankle Extensors to raise the body and shoulders a little
higher just before the start of the double-pole-push.
Knee Flexors (hamstrings) to make butt-drop aspect of the
double-pole-push quicker and more forceful.
Knee Extensors (quadriceps) to recover butt and hips up forward and
high. Which also raises the weight of the upper body, which is real work
in building "potential energy", which can be released in a later phase
to help add force to the pole-push.
Torso Rotation sideways -- reactive side-force to help the
skate-push. Mostly on the recovery-side, but perhaps some
side-force to help the skate-push on the poling-side.
