fartlek: a method of athletic training (especially for runners) in which strenuous effort and normal effort alternate in a continuous exercise
act: something that people do or cause to happen
atropine: a poisonous crystalline alkaloid extracted from the nightshade family; used as an antispasmodic and to dilate the eye pupil; also administered in large amounts as an antidote for organophosphate nerve agents or organophosphate insecticides