High-Intensity Interval Running Training (HIIT): A Method to Simultaneously Improve Speed and Endurance

As road running grows increasingly popular in Taiwan, from the Taipei Marathon and Wan Jin Shi Marathon to the Tianzhong Marathon and Taroko Gorge Marathon, hundreds of thousands of runners take to the course every year. This article focuses on “High-Intensity Interval Running Training (HIIT)” and provides Taiwanese runners with a systematic, immediately actionable guide from three perspectives: exercise physiology, training theory, and practical application. Whether you are a beginner just entering the world of running or an advanced runner chasing a personal best (PB), you will find training concepts and concrete methods tailored to your needs here. This article is approximately 8,000 words; we recommend saving it and reading it in sections while putting it into practice.

1. Building Core Concepts

The most common mistake many runners make when starting training is “training purely by feel” without a structured plan. In fact, running is a highly scientific endurance sport, involving the aerobic energy system, anaerobic energy system, musculoskeletal adaptation, neuromuscular coordination, and even the cultivation of mental fortitude. To make steady progress in Taiwan’s humid, changeable climate, you must first establish a correct training framework rather than blindly chasing mileage or pace.

We can break running ability down into four pillars: Aerobic Base, Lactate Threshold, VO2max, and Running Economy. These four are interconnected, and a deficiency in any single area will become the ceiling on your performance. All subsequent training recommendations in this article are designed around how to coordinately improve these four pillars.

Three Principles of Training

• Progressive Overload: Weekly training volume should not increase by more than 10% to avoid injury from the body being unable to adapt in time.
• Specificity: If you want to run a good marathon, you must accumulate enough marathon-pace mileage; if you want to run a fast 5K, you need to train speed.
• Recovery & Adaptation: Real progress happens during rest, not during the workout itself. Sleep, nutrition, and tapering are equally important.

2. The Science of Pace and Heart Rate

Pace is the most direct language of runners. The table below organizes the corresponding pace for each distance based on different target finish times. We recommend honestly assessing your current ability, choosing a slightly challenging but achievable goal, and then working backward to determine your daily training paces:

Target Finish Time	Full Marathon Avg. Pace	Half Marathon Pace	10K Pace	5K Pace
Sub-3 (2:59)	4:15/km	4:00/km	3:48/km	3:36/km
Sub-3:30	4:58/km	4:42/km	4:28/km	4:14/km
Sub-4	5:41/km	5:24/km	5:08/km	4:52/km
Sub-4:30	6:24/km	6:05/km	5:48/km	5:30/km
Sub-5	7:06/km	6:46/km	6:26/km	6:06/km
Sub-6	8:32/km	8:08/km	7:44/km	7:20/km

Besides pace, heart rate is another key metric. In Taiwan’s hot, humid summer environment, heart rate at the same pace can be 5 to 10 beats higher than in winter. Clinging rigidly to pace at such times can easily lead to overtraining. Learning to read heart rate zones allows your training to more closely reflect true physiological load:

Heart Rate Zone	% of Max HR	Perceived Effort	Primary Physiological Benefit
Z1 Recovery	50-60%	Very easy, can chat freely	Promotes blood circulation, accelerates recovery
Z2 Aerobic Base	60-70%	Easy, can speak full sentences	Improves fat metabolism, increases capillary density
Z3 Tempo	70-80%	Moderately hard, sentences become shorter	Improves aerobic endurance, glycogen utilization efficiency
Z4 Lactate Threshold	80-90%	Hard, can only speak single words	Raises lactate threshold, delays fatigue
Z5 VO2max	90-100%	Extremely hard, cannot speak	Improves VO2max, anaerobic capacity

Practical Advice: 80% of your training should fall in the easy aerobic zones of Z1-Z2, and only 20% should be high-intensity Z4-Z5. This is the famous “80/20 training rule.” The problem with many Taiwanese amateur runners is “too much moderate intensity, too little easy running,” which keeps them in a gray zone that is neither easy enough nor stimulating enough, leading to stalled progress and accumulated fatigue. Please resist the urge to run fast every day.

3. Periodized Training Structure

A complete race preparation plan should be worked backward from your target race date and divided into several training cycles. The following uses a 16-week structure as an example; you can adjust flexibly based on your own race schedule and fitness base:

Week	Phase	Weekly Mileage	Key Workouts	Long Run Distance
1-4	Base Phase	30-40 km	Mostly easy runs	8-12 km
5-8	Build Phase	40-55 km	Tempo runs + Intervals	14-20 km
9-12	Peak Phase	50-65 km	Marathon-pace runs	22-30 km
13-14	Peak Phase	55-70 km	Race-pace simulations	30-32 km
15-16	Taper	30-40 km	Maintain intensity, reduce volume	12-16 km

Key Points for Each Phase

1. Base Phase: Build your aerobic engine with plenty of easy running; the focus is on “volume” rather than “intensity.” This phase is the most commonly overlooked by beginners, yet it is the foundation for all future speed. It is recommended to add 2-3 core and strength training sessions per week while establishing a consistent running rhythm and daily routine.
2. Build Phase: Begin introducing tempo runs and interval training to stimulate the lactate threshold and VO2max. Long run distances gradually increase to build muscular endurance and mental resilience, and to teach the body to maintain good running form under fatigue.
3. Peak Phase: Heavily incorporate “race-pace runs” to imprint the rhythm of your target pace on the body. This is the toughest phase of the entire plan and the critical period that truly determines race performance. Be sure to simultaneously strengthen recovery and nutrition.
4. Taper: In the 2-3 weeks before the race, gradually reduce training volume (while maintaining intensity) to allow full recovery and glycogen supercompensation, so you can stand at the starting line in peak condition.

4. Practical Application in Taiwan

Taiwan’s geography and climate provide runners with a rich yet challenging training environment. The riverside bike paths in the north are flat with convenient aid stations, ideal for tempo runs and long-distance training; the pleasant winter climate in central and southern Taiwan is the golden season for chasing PBs; and the east coast and mountainous areas are paradise for trail and hill training. The table below organizes representative training routes for each region:

Region	Recommended Route	Distance	Features
Taipei	Riverside Bike Path (Dajia - Guandu)	Flexible 10-25 km	Flat, many aid points, safe for night running
New Taipei	Bali Left Bank	8-15 km	Sea breeze, open views
Taichung	Dongfeng Bicycle Green Corridor	12 km	Shaded, gentle slopes
Kaohsiung	Love River Trail	5-12 km	Urban, night views
Hualien/Taitung	Guanshan Loop Bike Path	12 km	Rural scenery, fresh air

Climate Reminder: Taiwan’s hot, humid months from May to September are a runner’s biggest enemy. During this period, training should be moved to early morning or late evening, with special attention to fluid and electrolyte replenishment. It is recommended to treat summer as a season for “building the base” and “heat adaptation,” saving key race-focused workouts for the cooler autumn and winter months. This is also why most experienced Taiwanese runners schedule their goal races between November and March of the following year.

5. Common Mistakes and How to Fix Them

Common Mistake	Consequence	Correction
Easy runs done too fast	Fatigue accumulation, poor recovery	Strictly cap easy runs at the upper limit of Z2 heart rate
Weekly mileage spikes	Overuse injuries	Follow the +10% per week rule
Neglecting strength training	Deteriorating form, poor efficiency	2 core and lower-body strength sessions per week
Insufficient fueling	Hitting the wall, cramping	Practice race fueling strategy in advance
Not prioritizing sleep	Poor recovery, declining performance	7-9 hours of quality sleep every night

These mistakes may seem basic, but they are the root cause of most runners’ long-term inability to break through. The art of training often lies not in “training more” but in “training smarter.” Learning to listen to your body’s signals—pushing when it’s time to push and resting when it’s time to rest—is the key to long-term progress and staying injury-free.

6. Advanced Training Details and Monitoring

As your training progresses into the mid-to-late stages, subjective feeling alone is no longer sufficient for precisely regulating load. It is recommended to introduce the following objective monitoring tools:

• Morning Resting Heart Rate (RHR): Measure every day upon waking. If it is noticeably elevated for several consecutive days, it is a warning sign of insufficient recovery or overtraining.
• Heart Rate Variability (HRV): Reflects autonomic nervous system status and is a good indicator of whether the body is ready for high-intensity training.
• Training Stress Score (TSS / Training Load): Use a running watch or platform to quantify the cumulative load of each session, avoiding sudden spikes in weekly load.
• Rate of Perceived Exertion (RPE): A subjective 1-10 scale assessment; it is the simplest yet most underrated tool.

Combine these data points with your training log, and you can build your own “body database.” After accumulating several training cycles, you will gradually understand your true performance at different paces, in different weather, and under different recovery states, allowing you to make more precise training decisions. This is the watershed moment for amateur runners advancing to the next level, and it is the most fascinating aspect of data-driven training.

7. Nutrition and Recovery Strategies

No matter how good the training plan, without corresponding nutrition and recovery, the results will be greatly diminished. Here are dietary and recovery recommendations for Taiwanese runners:

1. Carbohydrates: As the primary energy source, they should account for 55-65% of total calories on high-volume training days. Common Taiwanese staples such as rice, noodles, and sweet potatoes are all excellent sources.
2. Protein: Consume 1.4-1.8 grams per kilogram of body weight daily to support muscle repair. Chicken breast, tofu, eggs, and whey protein are all good choices.
3. Fluids and Electrolytes: Taiwan’s hot, humid environment causes heavy sweating; be sure to replenish with sports drinks or electrolyte tablets containing sodium and potassium after long runs.
4. Recovery Techniques: Consume carbohydrates and protein within 30 minutes after training (the golden recovery window), combined with foam rolling, stretching, and adequate sleep.

A special reminder: the “glycogen supercompensation” strategy before a race needs to be practiced in advance. Many runners suddenly eat large amounts of unfamiliar food the night before a race, only to suffer gastrointestinal distress. The best approach is to repeatedly test your own food and fueling combinations before and after long runs during the training period, find what works best for your stomach, and race day will go off without a hitch.

8. The Psychological Dimension and Long-Term Commitment

Running is a long-term dialogue with yourself. Many runners quit halfway not because their bodies give out, but because they lose motivation and direction mentally. We recommend setting “process goals” rather than only fixating on “outcome goals”—for example, treating “completing all the workouts this week” as an achievement, rather than obsessing over the seconds of a particular race. Joining a local running club or training group in Taiwan, where you can encourage each other, pace together, and share experiences, is one of the most effective ways to sustain long-term motivation. When you integrate running into the rhythm of your life, performance improvements become a natural byproduct.

During long races, mental skills are the decisive factor. Learning to break the race into smaller segments, using positive self-talk, and focusing on your breath and cadence rather than the remaining distance when you hit the wall can all help you push through the toughest moments. The gap between elite and amateur runners is often not in the body, but in a mind that remains steadfast in the face of pain.

9. Advanced Workout Examples and Weekly Plan

No matter how much theory is discussed, it must ultimately be translated into the training of each week and each day. Below is a typical advanced weekly training template that you can adjust flexibly based on your own fitness base, race goals, and recovery status. Remember: workout plans are rigid, but the body is alive. Any template should be continuously fine-tuned during execution, and listening to your body’s feedback always takes priority over blindly following the plan.

Day	Training Content	Intensity Zone	Purpose
Monday	Complete rest or easy walking	Z1	Recovery, repair of micro muscle damage
Tuesday	Intervals 6×800m (400m jog between sets)	Z4-Z5	Improve VO2max and speed
Wednesday	Easy aerobic run 8-10 km	Z2	Accumulate aerobic base mileage
Thursday	Tempo run 20-30 minutes	Z3-Z4	Raise lactate threshold
Friday	Rest or cross-training (swimming, cycling)	Z1-Z2	Active recovery, avoid repetitive load
Saturday	Long slow run 18-30 km	Z2	Build endurance and fat metabolism
Sunday	Easy run + running form drills (A-skip/B-skip, Strides)	Z1-Z2	Strengthen neuromuscular coordination

Execution Points: High-intensity days (Tuesday, Thursday) and the long run day (Saturday) must be interspersed with easy days to give the body enough time to absorb the training stimulus. If you feel particularly fatigued in a given week, proactively reduce the intensity or distance of one key workout rather than pushing through and risking injury or overtraining. Every three to four weeks, schedule a “down week” by reducing total mileage to 60-70% of normal to fully flush out accumulated fatigue—this often leads to the most noticeable performance jumps after training.

Additionally, running form drills such as A-skips and B-skips, and strides (6-8 repetitions of 100 meters at a fast but not sprinting pace), may not directly accumulate mileage, but they are key to improving running economy and preventing injuries. We recommend scheduling at least two sessions per week, performed at the end of easy runs. Over the long term, the improvement to running form and efficiency is very significant.

10. Frequently Asked Questions (FAQ)

Q1: Should I run every day?
A: For the vast majority of amateur runners, 4-5 sessions per week with 1-2 days of complete rest or cross-training is the optimal frequency for balancing progress and recovery. Forcing yourself to run every day tends to accumulate fatigue and injuries, which is counterproductive.

Q2: Does running necessarily damage the knees?
A: Scientific research shows that regular, progressive running actually helps strengthen the tissues around the joints. Knee pain mostly stems from sudden mileage spikes, insufficient muscle strength, or poor running form—not from running itself. Strengthening the glutes and core and controlling training load can significantly reduce the risk.

Q3: How long until I see progress?
A: You can feel changes in cardiovascular fitness within 4-6 weeks, but adaptation of connective tissues such as tendons and ligaments is slower, typically taking 3-6 months. Be patient and take a long-term view spanning an entire season or even several years. You will find that running is one of the few sports that “gets better with age.”

Q4: Is it normal for my pace to slow down in Taiwan’s hot, humid weather?
A: Completely normal. High temperature and humidity significantly increase cardiovascular strain, and a slower pace at the same heart rate is the body’s natural response. In summer, rely primarily on heart rate or perceived effort rather than fixating on pace numbers. Treat summer as a season for building your base and heat adaptation.

Conclusion

“High-Intensity Interval Running Training (HIIT)” is not a shortcut to instant results, but a systematic project that requires patient accumulation. We hope this article provides you with a clear training roadmap, helping you run faster, farther, and healthier on Taiwan’s racecourses. Remember: the best training plan is the one you can consistently execute. May you enjoy the pure joy of stepping out the door and running into the wind, and may you achieve your personal best at your next goal race. See you on the course!

Related Reading

• Beyond Running: How Cross-Training Improves Road Running Performance
• The Scientific Application of HIIT High-Intensity Interval Training in Running
• Interval Running Training: Methods to Improve Speed and Cardiovascular Fitness
• Core Strength Training for Runners: 15 Key Movements to Improve Efficiency and Reduce Injury