Learn Hardcore Swedish: Jag känner mig bra.

It translates to "I feel good." In this sentence, "jag" means "I", "känner" means "feel," "mig" is the reflexive pronoun equivalent to "myself" (used here as part of the expression), and "bra" means "good."

Why is the reflexive pronoun "mig" used in this sentence?

In Swedish, when expressing personal feelings with the verb "känna" used in this context, the reflexive pronoun is required. The "mig" indicates that the subject is experiencing the feeling themselves. Without it, the sentence would be grammatically incomplete or could lead to a different meaning.

Could the sentence be correctly written without the reflexive pronoun (i.e., "Jag känner bra")?

No, it cannot. Omitting "mig" would remove the reflexive structure that Swedish requires in this context. "Känna sig" is a fixed expression to convey a state of feeling, so "Jag känner bra" would be considered incorrect.

How is "bra" functioning in this sentence? Is it an adjective or an adverb?

"Bra" functions as a predicate adjective describing the subject’s state. While in English you might think of it adverbially (as in "feel good"), in Swedish, adjectives like "bra" are used directly without changing form, effectively describing how the subject feels.