Collocations for vigorous - adj.

be
become

extremely, fairly, very, etc.
He isn't used to such vigorous exercise.
They are leading a very vigorous campaign to get the chairman removed.

particularly

in
The group is not vigorous enough in its opposition to the proposals.

Vigorous is used with these nouns:
action, attack, campaign, debate, defence, denial, dissent, enforcement, exercise, exertion, growth, opponent, pursuit, shake, shrub, stroke, workout