Hello Nathalie King,
Here are links for you, also:
Natalie aka NAPS 2 B Fit.
You can find a basic PAR-Q here on IDEA on your homepage under My Membership. The blue box that says Professional Forms has one. (I know others may have more suggestions and different versions as well).
I would suggest taking the sample of the liability form and having an attorney tailor one to you and your business.
Hope this helps.