8 articles written about exercise equipment for SEO

I need 8 articles (one for each category of exercise equipment) for the purpose of SEO. The website for which they are targeting is a fitness and exercise equipment hire company that operates on a peer to peer rental basis. People with exercise equipment that they don't use can add their kit to the site and others can then rent it from them, with the owner making money.

Each article should explain things like why the kit should be used, what for, bullet points of benefits of each and their various applications.

Each article needs to be around 400 words.

The categories are as follows:

Exercise bikes
Cross trainers
Elliptical trainers (there's differences from cross trainers!)
Multi gyms
Rowing machines
Treadmills
Vibration plates
Weights