difficult to ...; hard to ...
teaching; instruction; teachings; precept; lesson; doctrine
throughout; over a period of ...; over a span of ...
bodily; physical; corporeal; sexual; sensual; of the flesh
mental; spiritual; emotional
thorough; exhaustive; complete
to temper thoroughly; to train well
astonished; shocked; amazed; astounded; aghast
no wonder; little wonder; after all; as expected; which isn't surprising
serious; severe; grave; acute
good; advantage; sake; purpose; consequence; result
pupil; disciple; adherent; follower; apprentice; young person
active duty; active service; student taking (university) entrance exams while still enrolled in school; student who passed their university entrance exams on the first try
period; epoch; the times; those days; oldness; ancientness
thousands; several thousand
(not) even once; (not) ever
to be defeated; to be beaten; to be unsuccessful; to lose
successive generations; successive emperors
technique; art; skill; move
to teach thoroughly; to instill (into); to instil; to inculcate; to drum (into); to drill (into)
to accept (e.g. an explanation); to be satisfied (with); to assent (to)
expression; look; countenance; face
from the beginning; from the first; of course; not to mention ...; not only ... but also ...
to forge; to temper; to drill; to train; to discipline
consent; approval; acceptance; agreement; compliance
to exchange (messages, greetings, arguments, etc.); to intersect; to cross; ... with one another; ... to each other
endlessly; continuously; (going) on and on; meandering; winding; sinuous
fatigue; weariness; exhaustion; fatigue (of metal, etc.)
match; game; bout; contest
(several) tens; dozens; scores (of)
physical; relating to stamina; in terms of physical strength
obvious; clear; plain; evident; apparent; explicit
witnessing; observing; sighting
vivid; bright; brilliant; skillful; skilful; adroit
toes; tips of the toes; toe of a shoe, sock, etc.
to be blown off; to blow off; to blow away; to vanish; to disappear; to be dispelled
the defensive; passive attitude; passivity; the passive; passive voice; ukemi (the art of falling safely)
near; close (to); nearby; (drawing) near; approaching; almost here
surprise; astonishment; wonder; amazement
lying face down; lying on one's face; placing upside down; placing face down
to run up to; to rush over