How do I put air in my Trek bike tires?

To put air in your Trek bike tires, follow these steps:

1. Locate the valve on the tire.
2. Remove the cap from the valve.
3. Attach the pump nozzle to the valve.
4. Pump air into the tire until it reaches the recommended pressure level.
5. Remove the pump nozzle and replace the valve cap.

Make sure to check the recommended tire pressure for your specific Trek bike model before inflating the tires.