Violations of a 1957 law requiring schools to give daily gym classes are common and often go unnoticed, reports say. A recent survey shows 47 of the 200 school districts surveyed do not comply with the law. Legislators and health experts are concerned over growing numbers of obese children. Academic requirements and a lack of space because of growing enrollments squeezed P.E. out of the curriculum, schools say. Illinois is the only state that still requires daily gym classes in public schools, reports say.