your rectus abdominis is the prime mover in a crunch exercise or spinal flexion
Synergists
jaw
Of all the muscles contracting simulataneously, the one that is mainly responsible for producing a particular movement is called the prime mover for that movement. The other muscles that help in producing the movement are called synergists. As prime movers and synergists muscles at a joint contract, other muscles, called antagonist muscles, relax.When antagonist muscles contract, they produce a movement opposite to that of the prime movers and their synergist muscles. -- I wrote kind of alot so you can under stand it just in case if you don't :)
femur
prime movers : muscle that initiate a particular movement synergism : muscles that have the same action of the prime mover antagonist : muscles that come into play to oppose a certain movement
The atissimus obrsi abdominals is the prime mover in a sit up.
Antagonists are muscles that work in the opposite direction from prime movers and synergists.
The agonist muscle
The agonist muscle
. The prime movers are the core muscles which include the abdominals (rectus abdominus, the transverse abdominus and the internal and external obliques), the lumbo-pelvic-hip area, and the back (erector spinae, quadratus lumborum, paraspinals and the psoas major). Other muscles used in this movement are the glutes and quadriceps.
The muscles which allow you to extend your wrist and flare your fingers are the flexor muscles in the wrist and the prime movers in the fingers. These muscles will coordinate to adduct the wrist and the fingers.
The Prime Movers - Michigan band - was created in 1965.