Press your lips together, add vocal cord vibration, then release.

Americans pronounce bar as BAR (/bɑr/). You'll hear it in sentences like "A large bar of chocolate is harsh on the heart".
Record yourself saying "bar" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 2 sounds. Explore each sound's mouth shape and how it's made.
The textbook way isn't wrong — it's just not how anyone actually says it.
Americans use a relaxed retroflex R — the tongue curls back rather than rolling. The R is one continuous sound with the vowel before it, not two separate sounds.