No way to gain km while apps is in the background

Why on earth do we need to have the apps on the scrren to gain KM? I went out to jogg with the apps open in the background while my running app is at the front. No KM gained.... like hell yeah Ill run while looking at my screen to make sure that screen remains active with the app... please fix this....

Burton1987 about Pokémon GO, v1.37.2