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From children to the elderly, moderate exercise brings good effects to the body.
Literal
Child [from-から] elderly [to-まで] moderate exercise [topic-は] body [for-にとって] good effects [object-を] brings.
Health-advice register. The pattern ~から~まで 'from X to Y' establishes an inclusive range. 適度な 'moderate, appropriate degree' is a na-adjective modifying 運動 'exercise.' もたらす 'to bring about, to cause' is a formal verb for producing results, common in science and policy writing (compare the less formal 起こす). ~にとってよい効果 'a good effect for ~' uses ~にとって to mark the entity from whose perspective the effect is judged.