On the right side of the PLAY you'll find left and right trigger buttons with a volume up and down rocker placed in between them. (bgr.com)
Grabbing with the left and right trigger buttons brings a unique feel to how you interact with the world, especially the climbing which can be very physical and perilous — you get a real sense of vertigo and you're acutely aware of the long drop below you! (blog.eu.playstation.com)
Hitting the right trigger button during a block performs a push block at the cost of one bar. (gamingunion.net)