dynamic

an efficient incentive; "they hoped it would act as a spiritual dynamic on all churches"

characterized by action or forcefulness or force of personality; "a dynamic market"; "a dynamic speaker"; "the dynamic president of the firm"

of or relating to dynamics

(used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being