calisthenics

As a letter s

is the letter s with a.

As a noun calisthenics is

(in the plural) gymnastic exercises, especially morning exercises, done to keep one's body healthy.

As nouns the difference between calisthenics and null

is that calisthenics is (in the plural) gymnastic exercises, especially morning exercises, done to keep one's body healthy while null is zero, nil; the cardinal number before einn.

As nouns the difference between calisthenics and workout

is that calisthenics is (in the plural) gymnastic exercises, especially morning exercises, done to keep one's body healthy while workout is an exercise session; a period of physical exercise.

As a noun calisthenics

is (in the plural) gymnastic exercises, especially morning exercises, done to keep one's body healthy.

As an adjective undefined is

lacking a definition or value.

As a noun calisthenics

is (in the plural) gymnastic exercises, especially morning exercises, done to keep one's body healthy.

As an adjective false is

(label) one of two states of a boolean variable; logic.

As nouns the difference between calisthenics and gymnast

is that calisthenics is gymnastic exercises, especially morning exercises, done to keep one's body healthy while gymnast is one who performs gymnastics.

As nouns the difference between calisthenics and antiestablishmentarianism

is that calisthenics is (in the plural) gymnastic exercises, especially morning exercises, done to keep one's body healthy while antiestablishmentarianism is a policy or attitude that views a nation's or society's power structure as corrupt, repressive, or unjust.

As a noun calisthenics

is (in the plural) gymnastic exercises, especially morning exercises, done to keep one's body healthy.

As a verb calibrate is

to check or adjust by comparison with a standard.

As nouns the difference between bodybuilding and calisthenics

is that bodybuilding is a sport in which the aesthetics of muscular development is the basis for competition while calisthenics is gymnastic exercises, especially morning exercises, done to keep one's body healthy.

As nouns the difference between acrobatics and calisthenics

is that acrobatics is the art of performing acrobatic gymnastic feats while calisthenics is gymnastic exercises, especially morning exercises, done to keep one's body healthy.