Post la sporto mia korpo estas laca, kaj mia piedo doloras.

In Esperanto, sporto is often used as a singular noun for the activity in general, where English may use sports.

• sporto = sport / sports / athletic activity in general
• sportoj = kinds of sports, or multiple separate sports

So post la sporto can mean after the sports activity or after exercising/playing sport. If you were listing different sports, then the plural sportoj would make more sense.

Here la shows that the speaker means a specific sports activity or occasion, not sport in general.

So:

• post la sporto = after the sport activity / after the game / after the training session
• post sporto would sound less specific and is less natural in this kind of sentence

English often leaves this kind of thing vague, but Esperanto often uses la when both speaker and listener can identify the event being talked about.

Because mia already makes the noun definite. In Esperanto, possessive words like mia, via, lia, ŝia, and so on usually replace la.

So you say:

• mia korpo = my body
• mia piedo = my foot

not normally:

• la mia korpo
• la mia piedo

This is different from English, where the and my are also not used together, so in this case Esperanto works similarly.

Because post is a preposition, and the noun after a preposition normally stays in the basic form, not the accusative.

So:

• post la sporto = correct
• post la sporton = not correct here

The -n ending is mainly used for direct objects and for some other special uses, but not after post in a normal phrase like this.

Both are possible, but they are slightly different in emphasis.

• Mi estas laca = I am tired
• Mia korpo estas laca = my body is tired

The version with mia korpo puts more focus on the physical body, not just the person in general. A learner should know that Mi estas laca is probably the more common everyday way to say it, but Mia korpo estas laca is still grammatical and understandable.

Because laca is basically an adjective meaning tired, and Esperanto often expresses this kind of idea with esti + adjective.

• estas laca = is tired

If you turn the root into a verb, the meaning changes:

• laci = to tire someone/something
• laciĝi = to become tired

So:

• mia korpo estas laca = my body is tired
• mia korpo laciĝas = my body is getting tired / becoming tired

That is why estas laca is the right choice for a state that already exists.

Because laca describes the singular subject korpo, and it comes after estas.

A few important points:

• korpo is singular, so the adjective is singular too: laca, not lacaj
• after esti, the adjective is not a direct object, so it does not take -n

So:

• mia korpo estas laca = correct
• mia korpo estas lacan = incorrect
• mia korpo estas lacaj = incorrect

Because doloras is the normal way to say that something hurts or aches.

• Mia piedo doloras = my foot hurts / my foot aches

You can also make an adjective:

• dolora = painful

But mia piedo estas dolora is less natural for a simple everyday statement like my foot hurts. It sounds more like you are describing the foot as painful rather than reporting the sensation in the usual way.

So for a body part that hurts, doloras is the most straightforward choice.

It is understandable, but depending on context, many speakers might choose a more specific word.

For example:

• post la trejnado = after the training session
• post ekzercado = after exercise
• post la matĉo = after the match

sporto is not wrong, but it is a bit broad. A native English speaker may want to know that Esperanto often sounds more natural when the activity is named more precisely.

Not necessarily. Esperanto often uses fewer commas than English, especially before kaj.

So both of these are possible:

• Post la sporto mia korpo estas laca, kaj mia piedo doloras.
• Post la sporto mia korpo estas laca kaj mia piedo doloras.

The comma can be used to show a pause or separate two full clauses clearly, but many writers would leave it out.

Yes. Esperanto word order is fairly flexible, although some orders sound more natural than others.

For example, these are all possible:

• Post la sporto mia korpo estas laca, kaj mia piedo doloras.
• Mia korpo estas laca post la sporto, kaj mia piedo doloras.
• Mia piedo doloras, kaj post la sporto mia korpo estas laca.

Starting with Post la sporto gives time information first, which is a very common and natural choice. It sets the scene before the main statement.