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Context: a boxer has just landed a great uppercut with an upward movement. His father describes the punch in this way:
荷重が乗りきってからの急激な〝縦〟一閃
I think here 乗りきる means "to overcome", so my rough translation attempt would be
(After) overcoming his weight, he did a sudden and quick upward/vertical movement
but I am confused by the が after 荷重. Shouldn't it be 荷重を乗りきってから? Is 荷重 the subject? Here you can see the whole page. Thank you for your help!
This 乗り切る is not "to overcome", but a simple combination of 乗る + 切る, "(for power/force/etc) to be put/applied/loaded" + "completely/fully". 荷重が乗り切ってから is "after his weight was fully put onto the punch". It can be rephrased as 荷重を乗せ切ってから ("after loading/putting his weight fully onto the punch").
