The synergists are the rectus capitis posterior major and obliquus capitis. The quadriceps, hamstrings, adductor magnus, and soleus serve as synergists during the exercise. The anterior deltoids are used as synergists in both variations. Its synergists are teres minor and the deltoid. Neem based products are considered effective synergists. Examples of pesticide synergists include Piperonyl butoxide and MGK 264. A large variety of synergists is used to tune properties of polyamide and polyester compounds. Muscles that work together to perform the same action are called synergists. Synergists are muscles that facilitate the fixation action. Synergists make pyrethrin more effective, allowing lower doses to be effective. Synergists, on the other hand, have varying beliefs regarding man's freedom to respond to God.