The calf is comprised of the gastrocnemius and soleus muscles. This stretch will affect the soleus primarily and gastroc secondarily.
Passive stretching is a technique that aims to lengthen the musculo-tendinous tissues with the use of some sort of external assistance such as a towel, resistance band, bodyweight or even a training partner.
Experts typically recommend avoiding passive stretches just before physical activities, using them instead as a cool down or recovery day tool.
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