This is the 15987th most frequent Polish word.
treningiem
"Treningiem" means "training" in English, in the instrumental case.
In this sentence, 'treningiem' is in the instrumental case, expressing the cause of fatigue after engaging in the workout.
Wczoraj byłem zmęczony po intensywnym treningiem.
Yesterday, I was tired after an intense workout.
Here 'treningiem' is also in the instrumental case, indicating the activity that is the reference point for the action of warming up.
Przed treningiem zawsze się rozgrzewam, żeby uniknąć kontuzji.
Before a workout, I always warm up to avoid injuries.
In this example, 'treningiem' is used in the instrumental case to denote the topic or context of the discussion related to the workout.