plural snack bars. snack bar. noun. plural snack bars. Learner's definition of SNACK BAR. [count] : a public place where small meals and snacks are served usually at a counter. There's a snack bar at the pool where we can get nachos.
All muscles exert their force by pulling between at least two points of attachment. The movement that results from contraction is called the action of the muscle. Typically, one attachment remains stationary and is called the origin and the other attachment moves and is called the insertion. Almost all muscles cross at least one joint (moveable connection between two bones) and cause an action across that joint.
There are many muscles that are responsible for primary body movements during exercise. They sometimes work in pairs; when one contracts, the opposite muscle stretches to allow a motion to occur. Other times, the muscle that causes a primary motion may part of a group of muscles that perform a similar function.The primary muscle is directly responsible for the movement while the others play an indirect, supporting role. It is not uncommon for one muscle to play an important role in more than one movement.here are also numerous muscles needed to move the torso during exercise to produce the full extent of movement in this region of the body. The erector spinae muscles of the back and the rectus abdominus of the front of the torso are primarily responsible for bending forward and backward.