Στο τέλος της μέρας με συμφέρει περισσότερο να κάνω λίγη ουσιαστική εξάσκηση παρά πολλή περιττή δουλειά που δεν με βοηθάει πραγματικά.

Yes. Στο τέλος της μέρας is a fixed expression.

• στο = σε + το = at/in the
• τέλος = end
• της μέρας = of the day

So literally it means at the end of the day.

Just like in English, it can be used:

• literally, for the actual end of a day
• idiomatically, meaning when everything is considered or ultimately

Also note that μέρας is the genitive singular of μέρα.

Because after τέλος Greek uses the genitive: the end of the day.

So:

• η μέρα = the day (nominative, subject form)
• της μέρας = of the day (genitive)

This is very common in Greek:

• στην αρχή της εβδομάδας = at the beginning of the week
• στο τέλος του χρόνου = at the end of the year

So Στο τέλος της μέρας follows a normal Greek pattern.

That is exactly how Greek structures this idea.

• συμφέρει = it is beneficial / it is advantageous
• με = me

So με συμφέρει means:

• it benefits me
• it suits me
• it is in my interest
• it makes more sense for me

Greek often uses this verb impersonally, with the thing that is advantageous treated as the subject:

• Με συμφέρει να φύγω τώρα. = It suits me / It’s better for me to leave now.
• Δεν με συμφέρει αυτό. = That isn’t in my interest.

So the structure may feel unusual to an English speaker, but it is very normal in Greek.

Because object pronouns in Greek usually come before the finite verb.

So:

• με συμφέρει = it benefits me
• με βοηθάει = it helps me

This is standard for weak object pronouns:

• με = me
• σε = you
• τον / τη / το = him / her / it

Examples:

• Με βλέπει. = He/She sees me.
• Σε ξέρω. = I know you.
• Δεν με καταλαβαίνει. = He/She doesn’t understand me.

With να-clauses, the pronoun still usually comes before the verb:

• να με βοηθήσει = to help me

Here περισσότερο means more or rather in a comparative sense.

In this sentence, it modifies the idea of what is more advantageous:

• με συμφέρει περισσότερο να... παρά...
• it benefits me more to... than to...
• more naturally in English: it makes more sense for me to... rather than...

So περισσότερο is setting up a comparison, and that comparison is completed by παρά.

Because modern Greek uses να + verb where English often uses an infinitive.

English:

• It benefits me to do...

Greek:

• Με συμφέρει να κάνω...

There is no normal standalone infinitive in modern Greek like English to do. Instead, Greek uses:

• να
  • verb form

So:

• να κάνω = to do / that I do
• να φύγω = to leave
• να διαβάσω = to study/read

This is one of the most important patterns in Greek.

Because εξάσκηση is a feminine noun, and the adjective/quantifier must agree with it.

• η εξάσκηση = feminine
• so: λίγη εξάσκηση = a little practice

Agreement:

• masculine: λίγος
• feminine: λίγη
• neuter: λίγο

Compare:

• λίγος χρόνος = a little time
• λίγη εξάσκηση = a little practice
• λίγο νερό = a little water

So λίγη is required because εξάσκηση is feminine.

Because δουλειά here is being treated as an uncountable idea, like work in English.

So:

• πολλή δουλειά = a lot of work
• λίγη εξάσκηση = a little practice

Greek often uses singular nouns this way when talking about a quantity of an activity or substance.

Also, the adjectives agree with δουλειά, which is feminine singular:

• πολλή
• περιττή
• δουλειά

If you wanted countable jobs/tasks, you would likely use a different noun or a plural context.

Ουσιαστική comes from ουσία (essence/substance), so it means something like:

• substantial
• meaningful
• real
• genuinely useful

So λίγη ουσιαστική εξάσκηση is not just a little practice, but a little practice that actually matters.

It contrasts nicely with:

• περιττή δουλειά = unnecessary / pointless work

So the sentence contrasts:

• a small amount of useful practice with
• a large amount of useless work

Here παρά means than or rather than in a comparison.

In this sentence:

• περισσότερο ... παρά ... means
• more ... than ...

So:

• με συμφέρει περισσότερο να κάνω λίγη ουσιαστική εξάσκηση παρά πολλή περιττή δουλειά = it benefits me more to do a little meaningful practice than a lot of unnecessary work

This is a very common pattern:

• Καλύτερα να φύγουμε παρά να περιμένουμε. = It’s better to leave than to wait.

Sometimes English will prefer rather than, which fits well here too.

Because Greek often omits repeated material when it is understood from context.

A fuller version could be something like:

• ...να κάνω λίγη ουσιαστική εξάσκηση παρά να κάνω πολλή περιττή δουλειά...

But since να κάνω is already clear, Greek naturally leaves it out:

• ...να κάνω λίγη ουσιαστική εξάσκηση παρά πολλή περιττή δουλειά...

English does the same thing sometimes:

• I’d rather do a little real practice than a lot of pointless work.

So the omission is natural and avoids repetition.

It is a relative clause describing δουλειά.

• δουλειά = work
• που = that/which
• δεν με βοηθάει πραγματικά = doesn’t really help me

So:

• πολλή περιττή δουλειά που δεν με βοηθάει πραγματικά = a lot of unnecessary work that doesn’t really help me

The clause tells you what kind of work it is: work that is not genuinely helpful.

Yes. In everyday Greek, που is the most common relative word for that, which, or who.

Examples:

• Το βιβλίο που διαβάζω = The book that I’m reading
• Ο άνθρωπος που μίλησε = The person who spoke
• Η δουλειά που κάνω = The work that I do

So in your sentence:

• δουλειά που δεν με βοηθάει = work that doesn’t help me

It is simple and very common.

Yes. Both βοηθάει and βοηθά are used.

They are two common forms of the same verb in the present tense:

• βοηθάει
• βοηθά

Both mean he/she/it helps.

So:

• δεν με βοηθάει πραγματικά and
• δεν με βοηθά πραγματικά are both correct.

Often:

• βοηθάει may sound a bit fuller or a bit more conversational to some speakers
• βοηθά is also completely normal

A learner should recognize both.

Πραγματικά means really, actually, or genuinely.

Here it strengthens the idea that the work is not truly useful:

• δεν με βοηθάει πραγματικά = it doesn’t really help me = it doesn’t genuinely help me

Without πραγματικά, the sentence would still be correct:

• που δεν με βοηθάει = that doesn’t help me

But πραγματικά adds emphasis and sounds more natural in expressing the speaker’s judgment.

Because they are modifying singular uncountable nouns:

• εξάσκηση = practice
• δουλειά = work

These are similar to English uncountable nouns:

• a little practice
• a lot of work

So Greek uses singular agreement:

• λίγη εξάσκηση
• πολλή δουλειά

If you had a countable plural noun, the form would change:

• πολλές ασκήσεις = many exercises
• λίγες μέρες = a few days

Yes.

• ημέρα is the more formal/full form
• μέρα is the common everyday form

So:

• στο τέλος της ημέρας and
• στο τέλος της μέρας both work

In everyday modern Greek, μέρα is extremely common and natural.

A useful way to break it down is:

• Στο τέλος της μέρας = discourse phrase / time-or-summary expression
• με συμφέρει περισσότερο = main clause: it benefits me more
• να κάνω λίγη ουσιαστική εξάσκηση = first option being compared
• παρά πολλή περιττή δουλειά = second option
• που δεν με βοηθάει πραγματικά = relative clause describing δουλειά

So the core pattern is:

με συμφέρει περισσότερο να X παρά Y

= it makes more sense for me to do X than Y

This is a very useful structure to learn because you can reuse it easily:

• Με συμφέρει περισσότερο να μείνω σπίτι παρά να βγω.
• Με συμφέρει περισσότερο να διαβάσω λίγο κάθε μέρα παρά πολύ μόνο μία φορά.