После бега мой пульс быстро пришёл в норму.

my

Breakdown of После бега мой пульс быстро пришёл в норму.

• быстро: quickly
• после: after
• пульс: the pulse

Questions & Answers about После бега мой пульс быстро пришёл в норму.

Why is it после бега and not после бег?

Because после requires the genitive case.

The noun бег becomes бега in the genitive singular:

• бег = running
• после бега = after running

This is a very common pattern:

• после урока = after the lesson
• после работы = after work
• после дождя = after the rain

So the important rule is:

• после + genitive

What exactly does бега mean here? Is it a run, running, or something else?

Here бега comes from бег, which means running or a run.

In this sentence, после бега is best understood as after running or after the run. Russian often uses a noun where English might prefer a gerund or a full clause.

So:

• После бега = after running / after the run

A native speaker may understand it either as:

• the activity of running in general, or
• a specific running session

Both are natural in context.

Why is it мой пульс? Could Russian just say пульс?