Swimming

Swimming was an act of propelling oneself through water. This could be done for recreation or participation in a sport.

The game of water polo involved swimming. 

When the USS Enterprise (NCC-1701-D) was due at Pacifica for a science mission in 2364, Counselor Deanna Troi thought of taking a swim in the planet's ocean. 

Lwaxana Troi was able to swim, as she informed Odo in 2369. 

In 2371, Chakotay was motivated by the desire to swim in the Gulf of Mexico and thus remained aboard the USS Voyager, as opposed to resettling on a Human colony in the Delta Quadrant. 

Later that year, Garak brought the captive Odo a container to "go for a swim" in, after he had answered Garak's questions. 

In 2375, while under the influence of a Borg vinculum, Seven of Nine proposed going swimming to Naomi Wildman. Naomi, however, said that she was not allowed to unless her mother was present.