Po treningu boli mnie stopa, więc odpoczywam w domu.

After training my foot hurts, so I rest at home.

Breakdown of Po treningu boli mnie stopa, więc odpoczywam w domu.

• ja: I
• więc: so
• po: after
• odpoczywać: to rest

Questions & Answers about Po treningu boli mnie stopa, więc odpoczywam w domu.

Why does po treningu mean after training, and why is treningu in that form?

The preposition po often means after in time expressions, and it usually requires the locative case.

• trening = training
• po treningu = after training

So treningu is the locative singular form of trening.

A few similar examples:

• po pracy = after work
• po obiedzie = after lunch
• po meczu = after the match

Why is it boli mnie stopa instead of something more literal like moja stopa boli?

Polish usually expresses pain with the verb boleć in a structure that is a bit different from English.

The natural pattern is:

• boli mnie + body part
• literally: the body part hurts me
• natural English: my body part hurts

So:

• Boli mnie stopa = My foot hurts

This is much more idiomatic than Moja stopa boli.
If you say moja stopa, it usually adds emphasis or contrast, not just neutral information.

What case is mnie, and why is it there?