Cnidaria (/naÉªËdÉÉriÉ/[4]) is a phylum containing over 10,000[5] species of animals found exclusively in aquatic (freshwater and marine) environments: they are predominantly marine species. Their distinguishing feature is cnidocytes, specialized cells that they use mainly for capturing prey.
Exercise Science is a multifaceted field of study in which movement or physical activity is the intellectual focus. This includes exercise of improvement of health and physical fitness and activities of daily living, work, sport, and play.
Exercise is physical activity that is planned, structured, and repetitive for the purpose of conditioning any part of the body. Exercise is used to improve health, maintain fitness and is important as a means of physical rehabilitation.tymology: L, exercere, to exercise. 1 n, the performance of any physical activity for the purpose of conditioning the body, improving health, or maintaining fitness or as a means of therapy for correcting a deformity or restoring the organs and body functions to a state of health.