The Overlooked Benefits of Zone 1 Running

How adding low-intensity workouts can boost your aerobic development and reduce injury risk

Apr. 2, 2026 at 5:56pm

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While zone 2 running is often the focus of training plans, zone 1 efforts can also play an important role in aerobic development and injury prevention. Experts explain how runners can intentionally incorporate zone 1 workouts into their warmups, cooldowns, easy runs, recovery days, and long runs to get more out of their training without increasing fatigue.

Why it matters

Zone 1 running is often overlooked, but it can provide similar aerobic benefits to zone 2 while lowering injury risk. Incorporating zone 1 efforts strategically into your training plan can help you run more consistently and arrive at race day feeling fresh and ready to perform.

The details

Zone 1 falls between 50-60% of your maximum heart rate, making it the lowest-intensity zone in the common five-zone model. While zone 2 (60-70% of max HR) is considered the sweet spot for aerobic development, zone 1 can also stimulate adaptations like increased mitochondria and capillary density. The difference between the two zones is more of a nuance than a stark line. Runners can use zone 1 efforts for warmups, cooldowns, easy runs, recovery days, and the start of long runs to manage fatigue and injury risk while still training the aerobic system.

  • Zone 1 running should be used for 5-10 minutes as a warmup before any workout.
  • Zone 1 efforts of at least 10 minutes should be incorporated as a cooldown after intense sessions.
  • Runners may spend a significant portion of their easy mileage in zone 1 to reduce fatigue and injury risk.

The players

Mike McMillen

Charlotte, North Carolina–based RRCA level II- and USATF-certified run coach, and founder of Flow Motion Running.

Janet Hamilton

Exercise physiologist and founder of Running Strong in Georgia.

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What they’re saying

“As long as your heart rate is in zone 1 or 2, you're going to be developing aerobically.”

— Mike McMillen, Run Coach

“If we can train consistently over long periods of time, that's where the magic really happens.”

— Mike McMillen, Run Coach

“All training is worthwhile. Zone 1, zone 2—it's all good for you. Just ask yourself: What's the point of this workout?”

— Janet Hamilton, Exercise Physiologist

What’s next

Runners should experiment with incorporating more zone 1 efforts into their warmups, cooldowns, easy runs, and long runs to see how it impacts their training and recovery. Monitoring heart rate and perceived effort can help determine the right balance of zone 1 and zone 2 running for individual fitness levels.

The takeaway

While zone 2 running is often the focus, zone 1 efforts can provide similar aerobic benefits while reducing injury risk. Strategically using zone 1 workouts as part of a well-rounded training plan can help runners train more consistently and arrive at race day feeling fresh and ready to perform.