What to look for in a prenatal vitamin. Prenatal vitamins are available by both over-the-counter and by prescription. Although formulations can vary from brand to brand, these are the most important vitamins and minerals to look for:
Muscle pairs. Antagonistic pairs of muscles create movement when one (the prime mover) contracts and the other (the antagonist) relaxes. Examples of antagonistic pairs working are: 1  the quadriceps and hamstrings in the leg.2  the biceps and triceps in the arm.uscle pairs. Antagonistic pairs of muscles create movement when one (the prime mover) contracts and the other (the antagonist) relaxes. Examples of antagonistic pairs working are: 1  the quadriceps and hamstrings in the leg.
A antagonist muscle is the muscle that opposes the agonist. So using the same example, during a biceps curl, the triceps is the antagonist muscle. This muscle relaxes as the biceps contracts. A synergist muscle is one that stabilizes a joint around which movement is occurring and helps to create movement. So again with the curl example, the brachialis and brachioradialis are the synergists muscles. They assist the biceps muscle and stabilize the elbow. When dropping the weight back down during a biceps curl exercise, the triceps becomes the agonist muscle and the biceps becomes the antagonist.