While using the FitBit app on your phone is more convenient, you can also download it on a Windows 10 laptop or computer. This helps if you want to view the app on a bigger screen. To manually log exercises on the Fitbit app on Windows 10, here’s what you need to do: 1. Launch the Fitbit app on your Windows 10. 2. Tap the “Exercise” tab on the dashboard. 3. Select the “+.” 4. Under “Exercise Type,” choose “Walk.” 5. Type in when you started your walk and how long it lasted. 6. Enter how many calories you burned. 7. Confirm the new data entry.