De or het sportinspanning?

The correct Dutch article is:

de sportinspanning

Rule Words ending in -ing: almost always de. See the rule

How to use sportinspanning

the sportinspanningde sportinspanning
this sportinspanningdeze sportinspanning
that sportinspanningdie sportinspanning
our sportinspanningonze sportinspanning
your sportinspanningjouw sportinspanning
every sportinspanningelke sportinspanning
which sportinspanning?welke sportinspanning?
a big sportinspanning / the big sportinspanningeen grote sportinspanning, de grote sportinspanning