Installed many apps, searches the web, however can't find reliable information about which muscles are hit during each exercise, some apps claim that exercises like pullover hits only muscles like (pectoralis major, serratus anterior) and some websites claim that it also hits pectoralis minor, is there any reliable way to know what muscles are hit with each exercise?

I have installed many apps and searched the web, however, I can't find reliable information about which muscles are hit during each exercise. Some apps claim that exercises like pullovers hit only muscles like the pectoralis major and serratus anterior and some websites claim that it also hits the pectoralis minor.

Is there any reliable way to know which muscles are hit with each exercise?