5 VO2 Max Workouts Lift Running Speed in About 6 Weeks

3 articles · Updated · Runner's World · Aug 19

Five interval-based workouts — from 1,000m repeats to 20-minute EMOM sprints — are highlighted as the most effective way for runners to raise VO2 max and improve race pace.
VO2 max measures how much oxygen the body can use during exercise, and coaches say the sessions should target roughly 90% to 100% of maximum heart rate — about 5K effort.
6 weeks is the rough timeline for noticeable gains with consistent training, while studies cited found 200m intervals over 10 weeks and HIIT blocks of four to 12 weeks significantly improved aerobic capacity.
2 workouts a month is the suggested starting point for beginners, rising to one a week for experienced runners, with hard sessions placed between easy days rather than after long runs.
Lab testing remains the most accurate way to measure VO2 max, though smartwatches, heart-rate formulas and at-home tests such as the Cooper or Rockport can provide estimates.