I was watching a video about preposition in German and the comparison between the uses of "in" and "bei", and how "bei" can be used with "Personen/ Firmen/Aktivitäten" and they used "Ich bin beim Sport" as an example for activities, but sadly I didn't get it. Some help please
In addition to what Ruruko wrote, there can be a spatial meaning involved. In this case,
Ich bin beim Sport.
could be compared to something like
Ich bin beim Bäcker.
I'm at the baker's. / I'm at the bakery.
Then, the meaning would be something like
I'm at the place where I (usually) exercise.
refering to a gymnasium, for example.
This grammatical form is called "Verlaufsform" and is similar to the English progressive form, so it describes a process that is currently taking place. It can also be used with "am" (then it is called "am-Progressiv") or "im".
The sentence has the same meaning as "Ich mache gerade Sport." = "I'm doing sports."
Some more examples:
- Ich bin beim Essen. = Ich esse gerade.
- Ich bin am Arbeiten. = Ich arbeite gerade.
- Ich bin im Weggehen. = Ich gehe gerade weg.
This is a vague expression and Sport is a large category encompassing both 'sports' and 'fitness / working out' in American English.
So I'd translate it as either "I'm at practice." or "I'm working out." — depending on whether the 'fitness' meaning of Sport is intended, or the 'team sport' meaning. Those two sentences have different information in them (place vs. activity), but that's colloquial Am. English.