If you are getting notifications from LiftEffort, then your Mac is infected with adware. LiftEffort is adware for Mac.
LiftEffort changes setting in your Mac. First, LiftEffort installs a browser extension in your browser. Then, after LiftEffort hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.