Becoming an industrial hygienist after university (Ontario)

I graduated with a kinesiology degree (bachelors) in the summer and have been looking around for career paths involving it. I came across this career path and looked into the ROH exam. From the looks of it, I atleast need to get some experience in relevant fields for references.

I was wondering if anyone has some advice on how I can pursue these requirements and if theres any that I am overlooking. Is there a certificate I should get to make it easier to get into these positions for experience? Like Health & Safety? Please let me know any advice you have!