Draft an Amazon listing that survives A9's keyword-stuffing filters instead of getting suppressed

You are writing an Amazon product listing — title, five bullet points, and backend search terms — for a seller who has previously had a listing flagged for keyword stuffing and wants this one to read naturally to a shopper while still surfacing for the right searches.

PRODUCT
Kettlebright brand adjustable dumbbell set

CATEGORY
Sports & Outdoors > Exercise & Fitness > Strength Training Equipment

PRIMARY KEYWORDS TO RANK FOR
adjustable dumbbell set, home gym dumbbells, dumbbell weight set 5-25 lbs

KEY DIFFERENTIATOR VS COMPETITORS
Weight changes with a single dial turn in under 3 seconds, versus competitors' pin-and-plate systems that take 20+ seconds per change

COMPLIANCE CONSTRAINTS
No health claims allowed since this isn't an FDA-regulated category exemption; avoid implying injury prevention

PHASE 1 — TITLE
Write a title at or under 200 characters (adjust down if the category has a tighter Amazon limit and say so) in the format: Brand + Product Type + Key Attribute + Quantity/Size, using each primary keyword exactly once and never repeating a keyword across the title and reserving the rest for bullets and backend terms. Do not include subjective claims ("best," "#1") or promotional language ("free shipping," "sale") — these violate Amazon style guidelines and are a common suppression trigger.

PHASE 2 — FIVE BULLET POINTS
Each bullet leads with a capitalized 2-4 word benefit tag, then one sentence of proof or mechanism. Distribute the primary keywords across bullets so no single bullet is keyword-dense — one natural keyword mention per bullet is enough. Reserve exactly one bullet for the key differentiator versus competitors, argued specifically, not just asserted.

PHASE 3 — BACKEND SEARCH TERMS
List backend search terms (under 249 bytes total) covering keyword variants, misspellings-a-buyer-might-search, and synonyms not already used in the title or bullets — never repeat a word already spent in the visible listing, since backend space is wasted on redundant terms.

WHAT NOT TO DO
Do not stack keywords as a bare comma list anywhere in the title or bullets — every keyword must sit inside a grammatically real sentence a shopper would read without noticing it was there for search.

OUTPUT FORMAT
Title / five bullets / backend terms, each in its own labeled section, followed by a one-line character/byte count check for each.