Voluntary muscles can be flexed.
The triceps brachii muscle does not flex the elbow; it is responsible for extending the elbow joint when it contracts.
The flex
Paralysis of the quadriceps femoris muscle would make an individual unable to flex the thigh. This muscle is responsible for extending the knee and flexing the thigh at the hip joint.
This muscle is also used to flex the thigh. The rectus femoris is the only muscle that can flex the hip. Injury to the rectus femoris muscle may result from overuse, as seen with kicking- or sprinting-related injuries. Inflammation of the muscle causes pain in the groin during physical exercises that use this muscle.
The best example is when you flex your arm to make the biceps look large. "Make muscle" it is sometimes called.
When you flex a muscle, it puts pressure on the muscle fibers, causing microscopic damage. This damage triggers an inflammatory response, leading to pain and soreness in the muscle.
When you flex your bicep, the muscle contracts and pulls on the tendons that attach it to your bones. If there is inflammation or strain in the muscle or tendon, it can cause pain when you flex your bicep.
supraspinatus muscle
The triceps brachii muscle does not flex the elbow; it is responsible for extending the elbow joint when it contracts.
Flex Your Love Muscle - 2012 was released on: USA: 8 January 2012
All Muscle with Funkmaster Flex - 2006 was released on: USA: 2006
hamstrings
The flex
The Quadriceps.
Bicep.
If you are asking what does someone mean when they say "I have muscle," it is slang for having a muscle "stick out" when you flex it.
the muscle is getting bigger because its pushing on the muscle behind it