What is the part of speech of the underlined phrase in the following sentence?

my grandmother's favorite form of exercise is swimming laps.

"swimming laps" is underlined.

noun

adjective

adverb

verb

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)

Which point(s) of view do whitman's and coleridge's speaker use ?

Can someone “think of a time you overcame a challenge or obstacle. describe the experience in two or three sentences”