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.
An agonist muscle is the primary mover, the one doing the work. An antagonist muscle is the opposite muscles. As one contracts the other will lengthen. Ex: Bicep curls - the Biceps brachii (shortening, contracting, concentric) would be the agonist and the triceps brachii (lengthening, relaxing, eccentric) would be the antagonist. A synergist would be the brachialis. (That is just one example). A synergist muscle(s) is a helper muscle(s)- they assist the primary with doing the work.....