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robust \rō-ˈbəst, ˈrō-(ˌ)bəst\ adj. 1. strong and healthy; hardy; 2. strongly built; 3. requiring bodily strength or endurance; 4. effective in all or most situations. –robustly adv., robustness n. 1540–1550;

Which definition in the entry best clarifies the precise meaning of the word robust in this sentence?

The personal trainer developed a new exercise routine that proved to be too robust for her clients.


definition 1

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definition 4