Learn Italian: La ginnastica mi dà energia. - The workout gives me energy.

The accent mark tells you this is the verb dare (to give). Without the accent, da is the preposition meaning "from" or "by". They sound exactly the same, so the accent is only there to prevent confusion in writing.

Why does ginnastica translate to "workout"? Doesn't it mean "gymnastics"?

It means both! While ginnastica is the word for the sport of gymnastics, Italians use it very commonly to talk about general exercise, fitness, or a workout. Another word you might see for a workout is l'allenamento.

Why is mi placed before the verb?

Here, mi is an indirect object pronoun meaning "to me" (The workout gives energy to me). In Italian, object pronouns almost always go immediately before the conjugated verb.

Why isn't there an article before energia?

You can drop the article here because you are talking about an unspecified amount of something (an uncountable noun). Just like in English, saying it gives you "energy" (instead of "the energy") means you don't need the definite article.