What is the meaning of Trimmen?

to work out, especially to jog

to trim the hair of a dog or a horse

to trim

to trim (a dog's hair, a man's beard, etc.)

to give the appearance, look or air (of); to decorate (as); to make (someone/something) up (as) [with accusative ‘someone/something’ and auf (+ predicate adjective) ‘in a particular way’]

to drill or condition [with accusative ‘someone’ and auf (+ accusative) ‘for a behaviour/behavior or mindset’]

to work out, to keep oneself physically fit through exercise

Source: wiktionary.org