Mary Duffy is a champion powerlifter, 71 years old and deadlifting like a boss. That’s all.
Activating the buttocks wakes up your gluteal muscles. It connects your brain to your muscle and gets the muscle going and ready to do something.
Activation of the glutes should be done before training, but it can also be done as an active break between sets. And trust me when I say that some activation of the buttocks before squats, lunges, and deadlifts will make for great glutes!