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Works opposite to the antagonist as it shortens and contracts.
Another name for the agonist is the 'prime mover' and is responsible for movement.
For example the biceps and hamstrings are agonists.

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Works opposite to the agonist as it lengthens and relaxes.
Acts as a 'braking' control over movement.
For example the triceps and quads.

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Link each muscle role to a variety of sporting action

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Link each muscle role to a variety of sporting action

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When you are jumping the quadriceps is the agonist movement.

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Fixation- is your core/abs of the body
Agonist- in the downward peddle the quadriceps is the primary mover
antagonistic- This is the hamstring which relaxes in opposition to the quad.
Synergist- This is the hip flexors which help the muscles work together.
References- BTEC level 3 Sport, Book 1, Mark Adams,Ray Barker, Adam Gledhill, Chris Lydon, Chris Mulligan, Pam Phillippo,Louise Sutton.
Picture-(http://www.visitharrogate.co.uk/things-to-do/cycling/mountain-bike-routes)

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The synergist movement is it stabilizes a joint around which movement is occurring, which in turn helps the prime mover function effectively. It also helps with the actual movement  e.g. in the bicep the synergist muscles are the  brachioradialis and brachialis which assist in the bicep to create movement and stabilize the elbow joint.  If you did not have the synergist movement then you could not extend or flex your bicep because the brachioradialis and brachialis muscles would not be there to assist. An example of a synergist movement is the curling in the bicep curl.
reference (http://groundupstrength.wdfiles.com/local--files/kinesiology%3Awhat-is-anagonist-antagonist-stabilizer-fixator/biceps-brachialis.jpg)

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The fixator is a movement in a muscle that will help stabilize the origin of the agonist and of the joint and the origin spans in this is to help the agonist function effectively. For example, a bicep curl would be the rotor cuff muscles. The majority of fixator muscles are found working in the shoulder and hips.