Push a stream of air from your throat through your open mouth. No tongue or lip contact.

Americans pronounce hobby as HAH-bee (/ˈhɑbi/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "She collects rocks and minerals as a hobby" or "He creates bonsai trees as a relaxing hobby" — more examples below.
Record yourself saying "hobby" and play it back. The mic stays on your device — nothing's uploaded.
2 syllables, 4 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
Push a stream of air from your throat through your open mouth. No tongue or lip contact.

Relax your lips and drop your jaw significantly. The tongue tip lightly touches behind the bottom front teeth and the back part of the tongue presses down a little to create more dark space in the back of the mouth.

Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
The textbook way isn't wrong — it's just not how anyone actually says it.
Stress falls on the first syllable, not the others. Stretch HAH — keep everything else short and quick.