i think there's exercise with breath & introspection.
one can focus on a body part or other thing as weapon being extension to body, using imagination perhaps as well ...
... i heard Japanese soldiers do this exercise as part of their training.
i read that breath joins what's conscious with what's subconscious.
by meditating on breath, focusing on energies flow to certain body part(s), one can understand better that part.
perhaps it's useful in training.
for now i use this mostly by focusing on breath in stomach,
imagining Mantra for Wisdom appearing in that body part,
being aware of stomach,
... in an attempt for burning fat & working with muscles around.