The adj brisk has 3 senses (first 2 from tagged texts)
1. (2) brisk, lively, merry, rattling, snappy, spanking, zippy -- (quick and energetic; "a brisk walk in the park"; "a lively gait"; "a merry chase"; "traveling at a rattling rate"; "a snappy pace"; "a spanking breeze")
2. (1) bracing, brisk, energizing, energising, fresh, refreshing, refreshful, tonic -- (imparting vitality and energy; "the bracing mountain air")
3. brisk -- (very active; "doing a brisk business")