important note

Greetings my dear colleague

Heelstrike will give an hipextensor contraction. That is partly concentric biut also the energy that will be come free, because the hip extensor is than oon his longest range and had an lot of energy that come free. But to get this action you need an heel strike.

i think the hip joint considered moved in concentric extension and appeared in less flexion attitude in relation to maximum flexion swing position !