。
Someday I'll run like the wind again.
Literal
Again someday wind [simile-のように] run [emphatic-んだ].
~のように is the standard simile marker, 'like X.' Note 風のように ('like the wind'), where の links 風 to the adverbial ように. The final んだ gives the sentence an assertive, resolute feeling — 'I will (resolve to) run again.' This is personal declaration, not a neutral description of the future.