I read a Frederic Delavier’s book « Strength Training Anatomy » and I learned good stuff.
Your feet on the step in passive flexion with yor legs stretched. Your torso inclined and your forearms are on the support. Your pelvis placed under the top pads :
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Do an extension of your feet or a flexion.
This exercise works triceps surae (composed of 2 gastrocnemius and soleus) and particularly gastrocnemius.
Variant
This movement can be done with a step under your feet, your forearms on a support and a person stradding your pelvis.
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-Steph