HIIT vs Zone 2: The Great Debate

Finding the Right Balance

Both high-intensity and low-intensity training have their place. Here's how to use each.

Understanding the Zones

Zone 2 (Low Intensity):

• 60-70% max heart rate
• Can hold a conversation
• Builds aerobic base, mitochondrial density

HIIT (High Intensity):

• 85-100% max heart rate
• Can only speak in short bursts
• Improves VO2 max, anaerobic capacity

The Optimal Split

For most people:

• 80% Zone 2
• 20% High Intensity

Yes, you read that right. Most of your training should be easy.

Why Zone 2 Matters

Zone 2 training:

• Builds mitochondria (your cellular power plants)
• Improves fat oxidation
• Enhances recovery capacity
• Creates the base for harder efforts

When to Go Hard

HIIT is powerful but costly. Use it:

• 1-2x per week
• When well-recovered
• For specific performance goals

Practical Application

Weekly Structure:

• Monday: Zone 2 (45-60 min)
• Tuesday: HIIT (20-30 min)
• Wednesday: Zone 2 (30-45 min)
• Thursday: Rest or yoga
• Friday: Zone 2 (45-60 min)
• Saturday: HIIT or sport
• Sunday: Active recovery