I read in some god awful men's health sort of thing that the Navy Seals consider finger tip push ups to be the ultimate for building finger strength (I guess they mean the bones and joints) and recruiting forearm strength. This seams bizarre, when I try them it just feels like you are locking out your joints and forcing your body weight down through them and not really engaging the forearms at all. What do other climbers on here think (hopefully you are more qualified than I!)?
AKAIU finger strength is very dependent on the grip trained. So training a non climbing 'hand shape' will have limited benefit to your climbing so there may be better use of your training time.
When the overhanging boulder you are working suddenly tilts over and falls on top of you, thank god you trained fingertip pushups so you can get the thing off your chest, probably without even releasing the holds.