Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.

Americans pronounce strengths as STREHNGTHS (/strɛŋθs/). You'll hear it in sentences like "The student's strengths are impressive" or "Let's leverage each other's strengths to overcome this obstacle" — more examples below.
Record yourself saying "strengths" and play it back. The mic stays on your device — nothing's uploaded.
1 syllable, 7 sounds. Explore each sound's mouth shape and how it's made.
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.

Touch the tip or front edge of your tongue to the roof of your mouth just behind your teeth. Keep your jaw relaxed. Stop the air, then release with a puff.

Curl or bunch your tongue without letting the tip touch the roof of your mouth. Brace the sides of your tongue against your upper back teeth, and round your lips slightly.
Drop your jaw moderately. Touch the tongue tip behind the bottom front teeth and lift the mid-front part slightly toward the roof.

Lift the back of your tongue to the soft palate. Lower your soft palate to let air flow through your nose.

Place the very tip of your tongue slightly between your teeth. Blow air gently around it without voicing.

Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.

Click any sentence to see the full breakdown — every link, every reduction, every flap-T.