"M uscle confusion" is a phrase used in fitness to describe changing your exercise routine frequently to make your muscles work harder and prevent them from getting too used to any particular movement. Full definition
Plus, you will have the benefit of muscle confusion AND muscle progression simultaneously to maximize your results. (thebettyrocker.com)
I'll admit, you make some good points, but the point about muscle confusion not being a real thing? (roypumphrey.com)
These are known as muscle confusion exercises and are designed to make sure your body doesn't adapt and get too used to your exercise program. (flexmastergeneral.com)