I. cal ‧ is ‧ then ‧ ics /ˌkæləsˈθenɪks, ˌkælɪsˈθenɪks/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: Greek ; Origin: kallos 'beauty' + sthenos 'strength' ]
the American spelling of ↑ callisthenics
II. cal ‧ lis ‧ then ‧ ics BrE AmE British English , calisthenics American English /ˌkæləsˈθenɪks, ˌkælɪsˈθenɪks/ noun [uncountable]
a set of physical exercises that are intended to make you strong and healthy