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Playing rugby, some of the many muscles used are your abdominals, hamstrings and quadriceps. When the athlete is running and about to plant the foot into the floor, the quadriceps are the agonist and the hamstring is the antagonist. Also in this position, the quadriceps are longer and the hamstrings are shorter. When picking the foot up off the floor, the quadriceps become the antagonist and the hamstring becomes the agonist. The quadriceps shorten and the hamstring lengthens.

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A muscle that relaxes to allow movement to happen. This muscle lengthens and works efficiently together with the agonist which contacts when the antagonist relaxes , this creates a cycle of movement. An example of an antagonistic pair is the biceps and triceps. When the Bicep relaxes while the tricep contracts which results in a movement which lifts the arm

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Riding a bike, the main muscles being used are your quadriceps, hamstring, gastronomes, and your gluteus maxims. Although the majority of the work comes from your quadriceps and hamstrings, as you pedal round quarter of the way your quadriceps do the work. The quadriceps contract causing extension at the knee this occurs when you start to pedal down, whilst this is happening your hamstring is relaxing because they are working in antagonistic pairs. Assisting this movement (still at a quarter of the way) is the gluteus maxims and the gastronomes this acts as a synergist. Your abdominals and back act as a fixator to keep you stable allowing you to stay on the bike. Finally as you pedal back up your hamstring (is the agonist and your quadriceps is the antagonist), the hamstring as you pedal back up flexes. Assisting the hamstring is the hip flex which helps you to lift the pedal back up to go for another stroke.

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A muscle that assists the agonist to create movement efficiently which also stabilizes joints.

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When kicking a ball in football your quadriceps acts as the agonist, whereas your hamstring acts as the antagonist. The synergist muscle is the gluteus maximus, and the fixator muscle is the abdominals.

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During a bicep curl the bicep brachii is the agonistic movement and the tricep brachii is the antagonistic movement. Your shoulder acts almost like a fixator as it fixes your arm straight but is still working. The synergist muscles are the brachioradialis and brachialis which assist the biceps to create the movement and stabilise the elbow joint, www.

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The muscle that is doing all the work (contracts). It is the muscle that shortens to make a joint. The agonist works in a pair. When the agonist contracts, the antagonist relaxes. The agonist is also known as a prime mover. It is responsible for the movement that takes place. Examples include our quadriceps on a leg extension and the bicep on a bicep curl.

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A muscle that stops a joint from moving. It also holds a joint in a certain position. Another name for this is a stabilizer. The fixator provides support to help assist in holding the rest of the body in place while the movement occurs. It stops unwanted movement when the agonist is working.