Definition of "calisthenic"

I will pass over the days of pap and petting, red shoes and blue sash, as being that only period when any thing of equality subsists between the sexes; and pass on to the time when all girls are awkward, and most of them ugly—days of back-boards and collars, red elbows, French, Italian, musical and calisthenic exercises.

1831, L[etitia] E[lizabeth] L[andon], chapter I, in Romance and Reality. […], volume I, London: Henry Colburn and Richard Bentley, […], pages 102-103