Give a very good understanding: under normal circumstances, you can't touch your toes when you sit forward, but you can touch your toes when you stretch your back thighs and calves.
This means that the extensibility of the organization has been improved, but this is only a short-term improvement, and it will return to its original state after a period of time.
Stretching can only change the ductility, but not the length of muscle, which makes it unrealistic to lengthen the calf by stretching and produce slender visual effects.
The length of muscle depends on the starting point and ending point of muscle, that is, the connection point between muscle and bone.
The calf muscle consists of the superficial gastrocnemius (two bundles) and the deep soleus (below gastrocnemius).
Gastrocnemius muscle: starting point: posterior side of femoral condyle; End point: embedded behind calcaneus through achilles tendon.
Soleus muscle: starting point: tibial soleus muscle line; End point: calcaneal tubercle
From the diagram above, we can see that gastrocnemius is connected with achilles tendon. The longer your achilles tendon is, the closer your gastrocnemius is. Visually, you will see that the calf with long achilles tendon is thinner and longer than the calf with short achilles tendon.
The length of achilles tendon is completely determined by genes, which you can't change.