Youtube or Vimeo for cycling reviews or touring videos or cycling races or running reviews and races. There is also Rouvy and a few other training apps apart from Zwift. Watch old tv shows on Netflix. Set up a fish aquarium and put it in front of the bike and zone out watching the fish. Everyone has to find what works for them. Fly fishing videos work for me, fly tying videos, travel documentaries, rowing races, the list goes on.