Synonyms: tone, tone up, strengthen
Definition: give a healthy elasticity to
Usage: Let's tone our muscles
Similar words: work out, exercise
Definition: do physical exercise
Usage: She works out in the gym every day
Synonyms: strengthen
Definition: gain strength
Usage: His body strengthened
Similar words: change
Definition: undergo a change; become different in essence; losing one's or its original nature
Usage: She changed completely as she grew older; The weather changed last night
Synonyms: beef up, strengthen, fortify
Definition: make strong or stronger
Usage: This exercise will strengthen your upper body; strengthen the relations between the two countries
Similar words: alter, change, modify
Definition: cause to change; make different; cause a transformation
Usage: The advent of the automobile may have altered the growth pattern of the city; The discussion has changed my thinking about the issue