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.
Agonist and Antagonists Below is a chart showing the main muscle group pairings in terms of Agonists (Prime Mover, Contracting) and Antagonists (Relaxing to allow movement).The Agonist is generally the muscle we are exercising, contracting and shortening to create movement.gonist and Antagonists Below is a chart showing the main muscle group pairings in terms of Agonists (Prime Mover, Contracting) and Antagonists (Relaxing to allow movement).The Agonist is generally the muscle we are exercising, contracting and shortening to create movement.