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Probably Rope. As it elongates, it stretches like muscles. Then it relaxes as it is not forced..
Stretches are important as it relaxes the muscles, so exercising would be more rewarding and also because pulling a muscle wouldn't be nice thing to go through.
It isn't just muscles, but the interaction between muscles, ligaments, tendons, nerves, and the bones that permit movement. In muscles only, it's contraction and relaxation, but without the rest involved, the muscles would not result in purposeful movements.
Skeletal muscles have an antagonistic relationship. To move about a joint one muscle contracts while its opposite muscle relaxes. For example, movement of the forearm is done through the bicep and tricep along the elbow joint.as one muscle contracts, the other relaxes
It relaxes your muscles to decrease pain and inflammation in your muscles.
muscles
Your brain sends impulses to nerves in your muscles when you desire to move. When the muscle contracts or relaxes, it puts on or releases tension of the ligaments connecting muscle to bone, causing motion.
I think what your after is called an antagonistic pair of muscles, for example the bicep and the tricep. When the bicep is contracting the tricep relaxes and when the tricep is contracting the bicep relaxes.
Smooth muscles
The bicep contracts while the tricep relaxes
muscles relaxes
The ciliary muscles