7 articles (500 words) for $20

I need a good writer for 7 articles with 500 words each (fitness, bodybuilding relating)
I provide keywords, you just need to write good content (no need to search for images at all)
My requirement: all articles should be:
- at least 500 words
- UNIQUE (I use copyscape to test, duplicate & low-quality + non-readable content will NOT be allowed)
- Seo onpage optimized ("exact keyword" density: 1-1.5%; in addition, you should vary keywords (paraphrase) to prevent Google penalty.
- Please include the URL you use for reference (1 URL's enough)

Thanks!