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Sometimes you need a little extra motivation to keep up with your fitness goals. Like, say, an alien invasion.

A story-based fitness app called Apocalypse Survival Training immerses you into an alternate reality in which earth is being invaded by aliens, and it’s up to you to help save civilization, reported Metro.

The story casts you as a secret agent fending off the space invaders against the backdrop of present-day London. The audio-guided app has different “episodes,” which are basically fitness routines that go along with the story’s theme. On the app, you’ll train for speed (running), strength (body circuits), and control (yoga and stretching). However, the user can focus on the story rather than the workout, immersing themselves in a world of secret organizations, high stakes, time travel, and more exciting plot points.