Here is the correct answer and the explanation to this “harder to catch riddle”.
Riddle: What is harder to catch the faster you run?
Answer: The answer to “What Is Harder to Catch the Faster You Run Riddle” is Your Breath.
Riddle Answer Explanation
Breath is hardest to catch, as we know that if we run faster our breath goes up and it’s harder to catch it and it’s a kind of idioms.
Catch your breath normal means to struggle with breathing normally and you may have heard people saying that when you breath heavily.