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health × 33training × 10
injury × 6
safety × 5
judo × 4
karate × 4
kickboxing × 4
recommendation × 4
strength × 4
exercise × 3
brazilian-jiu-jitsu × 2
mixed-martial-arts × 2
grappling × 2
throwing × 2
stance × 2
brain-injury × 2
kicking × 1
kung-fu × 1
sparring × 1
punching × 1
self-training × 1
tai-chi × 1
wing-chun × 1
sport × 1
flexibility × 1
