This post from a couple years ago has some good tips. In order for maximum parkour effectiveness, you need to be able to have both thumbs on the thumbsticks while pressing jump, crouch/roll. I have an elite controller and assigned one of the paddles to LB to avoid crushing my LB button again. But I know that doesn't work for everyone.
Console Sliding
in General Discussion
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This post from a couple years ago has some good tips. In order for maximum parkour effectiveness, you need to be able to have both thumbs on the thumbsticks while pressing jump, crouch/roll. I have an elite controller and assigned one of the paddles to LB to avoid crushing my LB button again. But I know that doesn't work for everyone.