Task: I want a kind of motivation for walking. Create a new walking activity starting today for 2 hours with 3 km in the Strava app.
Steps:
Open the Strava app
Click on the plus icon at the bottom right corner of the screen
Select the manual activity option
Click on the Run drop down button
Select walk option
Go to the time 0h column
Swipe up the hour dial upto 2 hrs
Swipe up the hour dial upto 2 hrs
Click on the OK button 
Go to the distance selection tab
Swipe the Km dial upto 3 km
Click on the OK button
Click on the Save button