The name “dynamic” warm up is a bit dramatic in my opinion. I prefer sport/activity specific warm up. And to that end, it is performing movements similar to the activity to be engaged in at a gradually increasing effort level and ROM. I teach the clients and athletes that I work with that this type of warm up has two main purposes. One, to have the body as best prepared to perform the activity at the desired intensity. And two, to uncover potential musculotendonus/musculoskeletal issues that may hinder performance or even lead to injury in order to address the issues prior to engaging in the activity.