In the end, he says you don’t need to wear blue-light-blocking glasses during the day. However, our bodies associate blue light with daytime, so exposure to it when you’re trying to go to bed ...

This prevents the belayer (you) from being pulled off the floor in the event the climber takes a fall (or if the climber weighs more than you do). Once both climber and belayer are tied in and set up, ...

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