There is a very simple exercise you can do to illustrate the continuity in the Superficial Back Line myofascial chain between gastrocnemius and hamstrings.
I would like to use this research study and article as a launching board for how we interpret and apply the results of a research study.
Running economy for distance runners is a complex multi-factorial measure of running efficiency, which reflects the combined functioning of biomechanical, neuromuscular, metabolic, and cardio-respiratory factors, some of which are hereditary and some of which adapt to coaching.
A study from Belgium also showed that the Achilles tendon displayed a twisted structure, with the greatest twisting found in the deep (anterior) layer of the tendon (lateral gastrocnemius and soleus).
Muscle stretching has inhibitory effects on spinal cord stretch reflexes in both stretched muscles and also non-local non-stretched muscles of the same leg.