pomhoofd planker
As the text "pomhoofd planker" seems random and untranslatable in English, it could be interpreted as a misspelling or a non-English term due to the second part "planker". If we assume it to be Dutch, and interpret "pomhoofd" as a "pom head" and "planker" as a person performing the plank exercise, a specific item could then be a man with a pompadour hairstyle doing a plank.
In English the description would be as follows: "A man with a voluminous, swept-back pompadour hairstyle wearing workout clothes, performing the plank exercise on a yoga mat in a bright, modern gym."