callisthenics (also calisthenics)

n [sing or pl v] exercises to develop strong and graceful bodies 柔软体操; 健美运动.

call on/upon sb (to do sth), call sb down, call sb out, call sb/sth off, call sb/sth up, call sth, call sth forth, call the roll, call up, call-box, call-girl, call-in, call-up, call...to account, caller, calligrapher, calligraphy, calling, calling-card, calliper (also caliper), callosity, callous, calloused, callously, callousness, callow, callowness, callus, calm, calm down, calmly, calmness, Calor gas, calorie, calories, calorific, calorimeter, calory, calumniate, calumnious,