Pickleball
Uses itHas played for more than 50 years; also a longtime tennis player; studies tactics via YouTube videos
In a Gates Notes post covered by GeekWire, Gates described playing pickleball for decades and learning strategy from top players' videos.
“Despite its silly terms and funny name, pickleball is actually quite a sophisticated game”Bill Gates
Source: He's kind of a big dill: Bill Gates on his pickleball past (article, 26 July 2022)