Authors on the topic of active recreation and sports

Good day, everyone!

I am looking for a permanent basis of several authors who can interestingly and vividly write about sports and outdoor activities - snowboarding, diving, quad bikes and so on.
The client is a large online store of goods (for sports and recreation – respectively), which now creates a large content story within their project. To connect wants good authors, not copywriters from the series “today I write about bags, tomorrow about gas tanks”, that is, involvement in the topic is the number one condition.