When it comes to improving speed, endurance, and overall running performance, few workouts are as effective as 90-second intervals at 8/10 effort with 90 seconds of recovery. This structured session strikes the perfect balance between intensity and recovery, making it a valuable addition to any training plan. Here’s why these intervals should be part of your routine:
1. Improves Speed & Anaerobic Threshold
Running at 8/10 effort brings you close to your lactate threshold, the point where your body starts accumulating lactate faster than it can clear it. Training at this intensity teaches your body to process and clear lactate more efficiently, helping you delay fatigue and sustain a faster pace for longer in races.
2. Enhances VO2 Max
VO2 max represents your body’s maximum oxygen uptake—a key factor in endurance performance. These intervals push your cardiovascular system to its limits, improving how efficiently your body utilizes oxygen during hard efforts. A higher VO2 max translates to better stamina and the ability to hold a strong pace throughout your runs.
3. Builds Mental Toughness
Pacing through multiple hard intervals with short recoveries mimics the ebbs and flows of racing. The mental discipline required to push through each interval prepares you to handle discomfort, stay focused, and maintain effort even when fatigue sets in—essential for race-day success.
4. Develops Efficient Running Economy
Running at this controlled but intense pace encourages better form, cadence, and biomechanics. As a result, you become more efficient, using less energy to maintain speed, which helps over longer distances.
5. Balances Stress & Recovery
The 1:1 work-to-rest ratio (90 seconds hard, 90 seconds easy) offers enough recovery to maintain intensity while keeping the session challenging. This balance prevents excessive fatigue and reduces injury risk compared to all-out sprints, making it a sustainable high-performance workout.
How to Use This Workout
This session is ideal for runners training for 5Ks to half marathons, as it boosts both speed and endurance. Here’s how to structure it:
- Beginner: 6 reps (90s on, 90s off)
- Intermediate: 8–10 reps
- Advanced: 10–12 reps
Perform this workout once a week, ensuring adequate recovery between sessions. Over time, you’ll notice improvements in your ability to sustain speed and manage effort during races.
Final Thoughts
Whether you’re aiming to break a personal best or simply become a stronger, more efficient runner, 90-second intervals at 8/10 effort are a game-changer. Add them to your training, stay consistent, and watch your endurance and speed reach new heights!
– Ziyaad Solomon