Article Writing - Fat Loss/weight loss/fitness/exercise

I am looking for a good quality writer who can write really good quality and smart articles covering the specific area of fat loss, weight loss, fitness in fat loss/weight loss. Ideally, I'd like you to be a native speaker. I need probably 20 articles to start with... if they are good and we cooperate OK, I would happily use you on regular basis + use you to help develop my stuff which I have no time to deal with + proof reading if you like. I would like to start from a list of titles so we could consult and generate some meaningful list together, I'd like to add a bit of my input (since this is my area) for the best final result. some key words will be also provided. I can also help somebody by providing a very good references so that you could get better at this too. Please bid for 20 articles of around 650 words and state how much time you require. Thank you