this basically explains it. notice folks always say that they have to 'mold' more chakra. combining physical and spiritual energies.Chakra is the molding of physical energy from the body and spiritual energy from the mind and combining it. so gaining more spiritual energy and more physical stamina would increase the amount of chakra you are allowed to control. so really to gain more chakra you need to train the mind and body.
Not really. in dbz, there's ki, and then there's "life energy". Tien's attack (tri beam) can defeat opponents several times his own strength (like semi perfect cell), but it depletes from his own life energy (the stuff in the spirit bomb). thats why he died after using it too much on napaChakra is basically Ki.
Spirit Bomb is not from his power though. It's from Nature; But in Naruto is a little Different because the chakra shinobi use comes from the Shinju not from Nature. Only sages can use Nature energy and turn it into some type of chakra form. It's most likely Ki within your body though.Not really. in dbz, there's ki, and then there's "life energy". Tien's attack (tri beam) can defeat opponents several times his own strength (like semi perfect cell), but it depletes from his own life energy (the stuff in the spirit bomb). thats why he died after using it too much on napa