Also in Judo, the muscles don't make you heavy - its your bone density that will increase a lot. From being thrown around all day, your bones will 'break' a thousand times. These 'breaks' won't affect the overall structural integrity, in fact, you'd want them to happen. Your bones have hollow spaces in them and the tiny walls between each space will sometimes break. The body repairs them - if one wall breaks, calcium is put into it to mend the break and also reinforce it. Reinforced is good because later on, the falls won't hurt at all - you become 'used' to it.
All of that falls under 'conditioning the body' in martial art terms.
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"Focus entirely on me, you ordinary soldier."
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