How to find inspiration to write articles about products

I'm lost, I would to promote products about health and fitness on a niche blog, writing articles about this argument, but I don't even know where to start, because I don't know anything about healt and fitness, but it is a profitable niche I would like to treat.
I could write usual obvious things, but I'm sure I will never exceed a hundreed words and I will be repetitive.

Any suggest? Thanks.

EDIT: Sorry for the title, it was a question not a sentence, but I can't modify it anymore.

1. Find similar websites to the one you will be making

Go over the 8 rules this website tells you how to format your descriptions

https://www.referralcandy.com/blog/product-descriptions-that-sell/ ( explains pretty nicely )

good luck

Be sure to check out legit content on the product that you'd like to promote. Most aff sites modifies product's merits to redirect effective conversions. But unlikely this isn't a good practice because repetitive buyers may bounce off. Go through a product's description and benefits through marketing sites such as Amazon. This could help create content that truly conveys what the product is capable of.

Hire a pro for this i think it is a good solution