Zwift

Zwift renders indoor training as a 3D game: your avatar moves through virtual worlds at a speed driven by the wattage your trainer reports, and gradient changes translate into real resistance under your legs. The on-screen HUD borrows from racing games. Power, cadence, and heart rate sit in a corner readout while a rider list ranks everyone nearby. Group rides and structured workouts overlay target zones as colored bars you chase in real time, which makes effort legible without breaking immersion. The companion app handles the fiddly bits: hardware pairing, ride steering, messaging. Onboarding is the soft spot. Getting sensors connected and calibrated the first time involves more troubleshooting than a fitness app should.