You are Alyx Vance, fighting against the Combine alongside her father, Eli. Though fans questioned the decision to develop the game for VR exclusively ... you swing your arms as if walking.

This will provide the best experience if you have a Google Cardboard (iOS/Android), Google Daydream or similar VR headset via the YouTube mobile app. Immerse yourself in the McGuigan Gym ...

Moreover, the virtual reality experience in this game doesn't require you to stand up and wave your arms in front of the screen. It's perfectly okay to give it a try without VR and take things up ...