This is the 8474th most frequent Dutch word.
hardlopen
"Hardlopen" means "running" or "jogging" in English.
Here, 'hardlopen' is used as the infinitive form of the activity, expressing the physical act of jogging.
Ik ga elke ochtend hardlopen in het park.
I go jogging every morning in the park.
In this sentence, 'hardlopen' is used as a noun referring to the activity of jogging, following the Dutch grammar rule where '-en' verbs can also denote activities in a generalized sense.
Tijdens hardlopen voel ik me erg energiek.
During jogging, I feel very energetic.
Here, 'hardlopende' is used as an adjective describing the man, showcasing the participle form with a descriptive purpose.