For both!
Cyclists can use Bike Sim Mode, which turns the games into cycling simulations:
you move through the game worlds at realistic cycling speeds (or multiples thereof).
Terrain incline and your weight are taken into account, so your speed is simulated realistically.
Structured workouts and Erg mode are also available for serious training.
Gamers can simply play through the games as usual, with their exercise effort woven
directly into the gameplay in real time — the harder you pedal, the stronger and faster your
character becomes, or the quicker they heal.