If you want to protect something from external influences, then you surround it with a suitable cover or other protective mechanism. So if it needs to be resistant to sharp objects or blows, it needs to be a hard, tough shell. The harder, the better - but the harder, the more inflexible in most cases. So if you want to have maximum freedom of movement at the same time as maximum protection, you can't avoid making certain compromises. Either you construct the armour in such a way that it consists of many small, flexible but interlinked elements - this serves the freedom of movement, but also brings more weight - or you optimise the material requirements to a minimum, but forfeit freedom of movement. The armoured rhinoceros, for example, has large panels that partially overlap so that it is still protected even when moving. Compromises are not always nice and comfortable - but sometimes necessary.
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