Push your lactate threshold higher with sustained hard efforts
Threshold intervals are sustained efforts at approximately half marathon race pace, designed to push your lactate threshold higher. These workouts sit between tempo runs and VO2max intervals in intensity.
The lactate threshold is the point where lactate accumulates faster than your body can clear it. By training at this intensity, you teach your body to sustain faster paces for longer periods.
Typically 8-15 minutes long with 2-4 minute recovery periods, threshold intervals provide sustained stimulus at your threshold pace while allowing brief recovery to maintain quality.
Threshold intervals specifically target your ability to sustain speed at the edge of comfort:
• Lactate threshold power - Increase the pace you can sustain before lactate accumulation
• Buffering capacity - Improved ability to neutralize acidic byproducts
• Fat oxidation - Better fat burning at faster paces
• Mental toughness - Learn to sustain discomfort
• Sustained speed - Hold faster paces longer in races
• Half marathon performance - Direct carryover to HM racing
• Fatigue resistance - Better ability to maintain pace when tired
Threshold intervals require disciplined pacing to hit the right intensity zone:
• Recent race time: Current half marathon race pace
• Talk test: You can speak in short phrases but it's uncomfortable
• RPE: 7-8 out of 10 - "hard" but sustainable
• Heart rate: 88-92% of maximum HR
Start with a proper 15-minute warmup including some pickups to threshold pace.
The first interval should feel controlled - you're aiming to complete all intervals at the same pace.
Recovery jogs should be long enough to catch your breath but short enough to maintain the training stimulus.
Finish with 10-15 minutes of easy cooldown.
Threshold intervals feel comfortably hard - sustainable but definitely working:
• First 2 minutes: Settling into rhythm, breathing controlled
• Middle portion: Focused effort, hard but sustainable
• Final 2 minutes: Mentally tough, maintaining pace and form
• At finish: Breathing hard, ready for recovery jog
• Each interval should be roughly the same pace
• If slowing significantly - started too fast
• If recovery feels too easy - intervals may be too slow
Easy pace with gradual progression. Include pickups to threshold pace.
Sustained efforts at half marathon pace. 3-4 repetitions with 2-4 minutes recovery.
Easy jogging to gradually lower heart rate.
Proper preparation is essential for threshold intervals:
• Minutes 1-10: Easy pace building gradually
• Minutes 10-15: 4-6 x 20-30 second pickups to threshold pace
• Easy jogging to bring heart rate down
• Light stretching if desired
Starting too fast - First interval should be controlled, not desperate.
Insufficient recovery - Don't rush the recovery jogs.
Too much volume - 30-40 minutes of threshold work is plenty.
Poor pacing - Intervals should be even-paced, not fading.
Introduction to threshold training
15 minutes warmup
3 x 8 minutes at HM pace with 3 minutes recovery
10 minutes cooldown
Classic threshold workout
15 minutes warmup
4 x 10 minutes at HM pace with 2.5 minutes recovery
12 minutes cooldown
Maximum threshold stimulus
15 minutes warmup
3 x 15 minutes at HM pace with 3 minutes recovery
15 minutes cooldown
Run these on rolling terrain to simulate race conditions.
Use measured routes or track to maintain consistent pacing.
Schedule these when well-rested for best quality.
Focus on smooth, sustainable effort throughout.
Browse our workout library to find structured threshold interval workouts.
Browse Threshold WorkoutsThese workouts are for educational purposes only. Always consult with your personal coach or qualified training professional before starting any new training program. They can provide personalized guidance based on your fitness level, goals, and individual needs.
