Some climbers believe that sanding your fingers is important when climbing sharp or rough rock surfaces (i.e. granite, sandstone), where your fingers might develop burrs from climbing.
Tip: Use a file, to sand off the burrs until the skin is smooth again. This helps increase positive traction when climbing, and also helps form the finger callus into one single layer.
We hope you found this video helpful. Feel free to comment below with questions or thoughts!
Please remember, climbing is inherently dangerous. Climb at your own risk.