This is the 338th most frequent Chinese word.
持续
Continue; sustain; persist.
In this sentence, "持续" is used as a verb meaning "to continue or persist," indicating an ongoing action or state.
天气持续恶化，我们被迫取消了出行计划。
The weather continued to worsen, so we had to cancel our travel plans.
Here, "持续" modifies "努力," emphasizing the sustained and continuous nature of the effort, functioning as an adverbial phrase.
他以持续努力的态度完成了这个项目。
He completed this project with a persistently diligent attitude.
In this context, "持续的" acts as an adjective describing "锻炼," highlighting that the exercise needs to be continuous and not sporadic.