The phrase "training dummy" refers to a mannequin or object that is used for practice and training purposes. It is used to simulate real-life situations and allow people to practice their skills or techniques. Full definition
If you want to walk away with 100 % completion, then this article will show you how to find all 23 Grazer Training Dummies in Horizon Zero Dawn. (primagames.com)
Unfortunately, there's no real big reward for finding and knocking down all 23 of the Grazer Training Dummies in Horizon Zero Dawn. (primagames.com)
Training mode is exactly what you'd expect, with training dummies and recording options. (vg247.com)