What is calasthetics?

this is a malapropism for the Word 'calisthenics', which can readily be found in the dictionary with the following meaning:

cal·is·then·ics /ˌkæləsˈθɛnɪks/ Pronunciation Key - Show Spelled Pronunciation[kal-uhs-then-iks] Pronunciation Key - Show IPA Pronunciation -noun 1. (used with a plural verb) gymnastic exercises designed to develop physical health and vigor, usually performed with little or no special apparatus. 2. (used with a singular verb) the art, practice, or a session of such exercises. Also, callisthenics.

---- [Origin: 1840-50; cali- (var. of calli-) + Gk sthén(os) strength + -ics]