When you are hanging from a ledge, a Grip Gauge appears on screen. By doing a ton of pull-ups (press L2 and R2 simultanously), you can increase the Grip Gauge and increase the alotted time that you are able to hang from a rail.
Level | How to unlock
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Grip Gauge Level 2 | Do 100 Pull-ups.
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Grip Gauge Level 3 | Do 100 Pull-ups after unlocking Grip Gauge Level 2.
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