Example : A brisk walk in the park.
A lively gait.
A merry chase.
Traveling at a rattling rate.
A snappy pace.
A spanking breeze.

Synonyms : alert, lively, merry, rattling, snappy, spanking, zippy

Example : The bracing mountain air.

Synonyms : bracing, fresh, refreshful, refreshing, tonic

Example : Doing a brisk business.

Example : Business brisked up.

Synonyms : brisk up, brisken