1. Prime movers/agonist or Main movers:
This is our large muscle when we train in the gym for example doing biceps curl our biceps brachii means in general biceps Main Muscle is the prime mover.
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You know these opposite muscles oppose the action of prime movers means they are the opposite side of main muscle they are relaxed and stretch, for example while doing biceps curl triceps are antagonists means opposite muscle.
3. Synergist means assisted muscle:
These muscles help the prime movers in movement, they are small In size as well for example while doing biceps curl assisted smaller muscles are brachialis and brachioradialis these both are part of the biceps muscle.
4. Fixators: Means stabilizers
These muscles help to hold the body whiles another part of the body is moving for example doing biceps curl deltoids and abdominal are fixators.
I hope this will gain your knowledge.