scalene muscles
Upper Trapezius
Sternocleidomastoid
the trapesious muscle
Trapezius
the trapesious muscle
to make it tight
Your hamstring muscles.
hamstring group of muscles
Hamstring
The sternocleidomastoid muscles are the ones that flex when the intercostals are flexed. This will also cause the scalene muscles to flex.
To flex your chest, you tighten the muscles that are in that area. This might include your arms or back as well, but you tighten the muscles in your chest and abs.
Abdominal muscles are trunk muscles that help to rotate and flex the spine. The abdominal muscles are composed of:Rectus abdominus: originates at the pelvis and inserts into the sternum as well as ribs 5-7. This muscle flexes the spine or assists in posteriorly (behind or in back of) tilting the pelvis.External obliques: one of the abdominal muscles responsible for rotation and flexion (position that is flexed relative to neutral or extension) of the spine. Developing external oblique strength is important for spinal stabilization against movement faults.Internal obliques: one of the abdominal muscles responsible for rotation and flexion of the spine. Developing internal oblique strength is important for spinal stabilization against movement faults.Transversus abdominus: an important spinal-stabilizing muscle
Muscles can contract and shorten
i done no
You flex your muscles to do this and these pull on the tendons which link the muscles to the bones.
The quadriceps extends the thigh and the hamstring muscles flex the knee