Lattice Coach Josh, Jason Hooper from @HoopersBeta and Tyler Nelson from @c4hp answer the age old question!
The hangboard is without a doubt one of the best and most specific training tools available to climbers. The value of this training tool, matched with its versatility makes hangboarding one of the most common training methods for climbers of every level.
However there is still some controversy around the minimum requirement of a climber to start using a hangboard. The main justification AGAINST using a hangboard is that it poses a risk to beginners because they are not conditioned enough to tolerate the intensity of training and their time might be better spent climbing, developing better technique.