The right answer is Joints (or ligaments more precisely).
Muscle is the contractile structure that produces strength. It has components that allow it to be shortened to create what is called a muscle contraction.
The joint is junction of two parts of the skeleton allowing them relative mobility.
The ligament is an elastic structure that stabilizes the joints. It therefore attaches from one bone to another.
Use this link:
https://www.khanacademy.org/math/algebra-home/alg-basic-eq-ineq/alg-old-school-equations/v/averages
Unhealthy belief- all couples fight and it is necessary for the relationship to work out
Reason for it's unhealthy- all couples are different and a relationship should revolve around violence and verbal conflicts
Healthy belief- All couples may have to deal with conflicts but there is violence and verbal abuse isn't the answer
