High-Intensity, Low-Volume Training (HILIT): Progress with Just 6 Hours a Week

The Truth About Junk Miles

Many amateur cyclists fall into a trap: riding 8-10 hours a week, but spending most of that time in a gray zone that is “neither easy enough nor hard enough.” These miles look substantial on paper, but they contribute very little to fitness gains—this is what is known as Junk Miles.

A study on amateur cyclists (Muñoz et al., 2014) found that when trained riders reduced their weekly training time from 11 hours to 7 hours while keeping the total volume of high-intensity training unchanged, their FTP not only failed to decline over 4 weeks, but actually improved slightly by 1.2%. The reason is simple: improved recovery quality offset the reduction in training volume.

Definition and Principles of HILIT

HILIT (High Intensity, Low Volume Training) is a training philosophy built on these core principles:

1. Keep weekly training time between 4-6 hours
2. Schedule 3 Key Workouts per week, each containing high-quality intensity intervals
3. Completely eliminate purposeless moderate-intensity riding
4. Choose complete rest over low-intensity riding on recovery days
5. Training quality > training quantity

Who HILIT Is Suitable For

• Working cyclists with fewer than 6 hours of available training time per week
• Amateur cyclists with family responsibilities and fragmented schedules
• Riders with 1-2+ years of training foundation who have hit a plateau
• Taiwanese commuter cyclists (who may only have 1 hour in the early morning or evening on weekdays)

Who It Is Not Suitable For

• Beginners (who need to build a basic fitness foundation first)
• Those targeting endurance events longer than 3 hours
• Riders with ample training time (> 10 hours/week)

Key Workouts vs. Fill-In Rides

Defining Key Workouts

Key workouts are training sessions with a clear, specific physiological stimulus goal. Each session focuses on only one primary objective:

Key Workout Type	Target Ability	Typical Format	Duration
VO2max Intervals	Maximal oxygen uptake	4-5 × 4 min @ 110-120% FTP	60 min
Threshold Cruise	Lactate threshold	2-3 × 15-20 min @ 95-100% FTP	70 min
Over-Under	Threshold tolerance	4 × (3 min 105% / 3 min 90%)	65 min
Micro-Intervals	VO2max + Anaerobic	3 sets × 10 reps of 30/15	55 min
Long Threshold	Endurance threshold	1 × 40-60 min @ 88-92% FTP	75 min
Sprint Intervals	Anaerobic power	8-10 × 30 sec all-out (4 min recovery)	55 min

The Role of Fill-In Rides

Within the HILIT framework, the role of fill-in rides (recovery rides, low-intensity aerobic) is drastically reduced or even eliminated. Research shows that for riders training fewer than 6 hours per week, complete rest days provide better recovery than low-intensity recovery rides.

Four HILIT Weekly Plan Templates

Template A: Classic Three Workouts (Suitable for Most)

Monday: Complete rest
Tuesday: Key Workout 1 — VO2max Intervals (60 min)
Wednesday: Complete rest
Thursday: Key Workout 2 — Threshold Cruise (70 min)
Friday: Complete rest
Saturday: Key Workout 3 — Weekend Ride (90-120 min, including intensity blocks)
Sunday: Complete rest or light activity (walking, yoga)

Total training time: approximately 3.5-4 hours

Template B: Four Workout Version (For Those with a Bit More Time)

Monday: Complete rest
Tuesday: Key Workout 1 — Micro-Intervals 30/15 (55 min)
Wednesday: Recovery ride Zone 1 (30 min) or rest
Thursday: Key Workout 2 — Over-Under (65 min)
Friday: Complete rest
Saturday: Key Workout 3 — Long ride with threshold blocks (2-2.5 hours)
Sunday: Key Workout 4 — Short high-intensity (40 min sprint intervals)

Total training time: approximately 5-5.5 hours

Template C: Early Bird Commuter Version (Using Commute Time)

Suitable for Taiwanese cyclists who bike-commute (30-45 min one way)

Tuesday commute to work: Normal commute (aerobic warm-up)
Tuesday commute home: Commute + detour including 3 × 5 min threshold blocks
Thursday commute to work: Commute with micro-intervals (10 × 30/15)
Thursday commute home: Easy commute
Saturday: Long ride 2 hours (with structured intensity blocks)

Total training time: approximately 5-6 hours (including commuting)

Template D: Indoor Trainer Version

Suitable for cyclists who only use an indoor trainer

Tuesday: TrainerRoad / Zwift structured workout (60 min)
  Recommended workout: Vo2max — "Baird" series
Thursday: TrainerRoad / Zwift structured workout (60 min)
  Recommended workout: Threshold — "Kaweah" series
Saturday: Zwift group ride or race (60-90 min)
  Choose the B or C group closest to your ability

Total training time: 3-3.5 hours

8-Week HILIT Progressive Plan

Week	Workout 1 (Tuesday)	Workout 2 (Thursday)	Workout 3 (Saturday)	Weekly TSS
1	3×4 min VO2max	2×15 min Threshold	Long ride 2 hours	250
2	4×4 min VO2max	2×18 min Threshold	Long ride 2 hours with Tempo	280
3	3 sets × 10 reps 30/15	3×12 min Threshold	Long ride 2.5 hours	310
4	Recovery Week 2×3 min	1×15 min Threshold	Easy ride 1.5 hours	180
5	5×4 min VO2max	2×20 min Threshold	Long ride 2.5 hours	320
6	3 sets × 12 reps 30/15	Over-Under 4×6 min	Long ride 2.5 hours with Threshold	340
7	4×5 min VO2max	1×30 min Threshold	Race simulation 2 hours	330
8	Recovery/Test Week	FTP Test	Easy ride	200

Nutrition Strategy: Fueling High-Quality Training

Since every HILIT session is high-intensity, nutrition becomes especially critical:

Pre-Training (1-2 hours before)

• Carbohydrates: 1-2g/kg body weight
• Avoid high-fiber, high-fat foods
• Taiwan recommendations: a bowl of white rice + a small amount of lean meat, or 2 bananas + 1 energy bar

During Training (for sessions over 60 minutes)

• 30-60g of carbohydrates per hour
• Sports drink or energy gels

Post-Training (within 30 minutes)

• Carbohydrates: 1.0-1.2g/kg
• Protein: 0.3-0.4g/kg
• Taiwan recommendation: a convenience store soy milk + onigiri combo is ideal

Long-Term Viability of HILIT

Applicable Period

HILIT is not recommended year-round. Best practices are:

• HILIT Phase: 8-12 weeks (when time is most limited)
• Normal Training Phase: Return to a more balanced training distribution
• Alternating Use: 2-3 HILIT blocks can be scheduled per year

Why Can’t You Do HILIT All the Time?

1. Slow Deterioration of Aerobic Base: Without long-distance rides, mitochondrial density and capillary networks gradually decline
2. Accumulation of Nervous System Fatigue: Sustained high-intensity training will eventually lead to sympathetic nervous system fatigue
3. Decline in Technical Skills: High-cadence pedaling efficiency, descending skills, and other techniques require riding volume to maintain

Success Case Study and Data

A 38-year-old commuter cyclist in Taipei, FTP 235W, with 5 hours of available training time per week:

Metric	Before HILIT	After 8 Weeks of HILIT	Change
FTP	235W	248W	+5.5%
5-Minute Max Power	305W	322W	+5.6%
Body Weight	72kg	71.5kg	-0.7%
W/kg (FTP)	3.26	3.47	+6.4%
Fengguizui PR	28:45	27:12	-5.4%

Conclusion

“Train less but train smart” is not an excuse to be lazy, but a science-based training optimization strategy. The core insight of HILIT is: For amateur cyclists with limited time, the marginal return on training quality is far higher than the marginal return on training volume. When you only have 5 hours, rather than spreading it evenly across moderate intensity that doesn’t push you, it’s better to make every minute count where it matters most.

Related Reading

• High-Efficiency Training in Short Time: The 45-Minute Explosive Workout for Busy Office Workers
• HIIT vs Traditional Endurance Training: Which Is More Effective for Boosting FTP?
• Weekly Training Arrangement for Cycling: Time Management Strategies for Commuter Riders
• Data Analysis Strategies for Time-Limited Riders: Maximizing Training Benefits with Minimal Time