The overall rating reflects the current state of the app. It accounts for all app reviews but prioritizes the most recent ones.
Global Gym Wear
App wants you to approve payments before you even start the free trial, very annoying... probably designed that way to get at least one month out of you before you delete it as you'd never remember to cancel it 14 days after the start.
The other reviews are probably correct, it's probably not worth the money it terms of recovered sales.