The USS Enterprise-D Parrises squares team, in uniform.
Parrises squares is the name of a vigorous athletic game that was popular with teens during the 24th century, much to the concern of parents.
When playing parrises squares, players often wear unique padded uniforms, and use a piece of equipment called an ion mallet.
The Starfleet Academy team faced the Minsk team in the parrises squares Championship Finals of 2327. It came as a big surprise when Starfleet Academy won, as the Minsk team was favored. Starfleet cadets threw a celebratory party that wreaked havoc on the academy grounds, that took Boothby three weeks to repair. (TNG: "The First Duty")
M'Kota R'Cho was the only Klingon national that played parrises squares, when he participated in the controversial Championship Finals of 2342. (VOY: "Year of Hell, Part I")
Starbase 74 had a parrises squares team, which the Enterprise team played against during its stay there in 2364. (TNG: "11001001")
When the Doctor created a holographic family for himself in 2373, his 'daughter' Belle was on her school's parrises squares team. This worried her 'parents', because parrises squares can be a dangerous game for someone her age. It later turned out their worries were justified, as she later 'died' of complications from a parrises squares injury. (VOY: "Real Life")