Learn Farsi: مربی به من برنامه می‌دهد برای اینکه عضله بسازم. - The coach gives me a schedule in order to build muscle.

Because it follows barâ-ye inke (in order to / so that). This conjunction introduces a goal, purpose, or desired outcome rather than a confirmed fact. In Farsi, when we talk about a goal we want to achieve, we drop the mi- prefix and use the present subjunctive form of the verb.

How do we build the subjunctive verb besâzam?

It comes from the infinitive sâkhtan (to build or make). First, we take its present stem, which is sâz. Then we add the subjunctive prefix be- at the beginning and the first-person singular ending -am at the end, giving us besâzam (that I build).

The coach gives the schedule, but how does the sentence show who is building the muscle?

You can tell exactly who is doing what by looking at the verb endings. The first verb midahad ends in -ad (he/she), which matches the coach. The second verb besâzam ends in -am (I), which means you are the one building muscle. Farsi smoothly connects different subjects in one sentence using conjunctions like barâ-ye inke.

Could I use the word tâ instead of barâ-ye inke in this sentence?

Absolutely. You could say tâ azoleh besâzam, and it would mean the exact same thing. Both conjunctions mean 'so that' or 'in order to' and require the subjunctive verb. barâ-ye inke is just slightly more emphatic or formal, but they are very often interchangeable.