Sub Meaning in running. "Sub-sub" in running means finishing a race in less than a specific time goal that itself is already under a whole number (e.g., sub-1 hour 30 minutes for a 10K).The prefix "sub" (from Latin sub, meaning "under/below") denotes times strictly below a set benchmark. While "sub-30" (5K) or "sub-2" (half-marathon) are standard terms, "sub-sub" adds an extra layer—like sub-1:25 (10K) or sub-1:45 (half-marathon)—to reflect incremental progress toward elite standards. # # #joggi