Understanding Your Training Zones

Training zones help you run at the right intensity for each workout type. Running too hard on easy days and too easy on hard days is the most common mistake runners make.

Zone 1: Recovery (Very Easy)

• Purpose: Active recovery, promotes blood flow
• Feel: Could hold a full conversation, almost too slow
• When: Day after hard workouts or races

Zone 2: Easy/Aerobic (Base Building)

• Purpose: Build aerobic base, fat adaptation
• Feel: Conversational pace, comfortable
• When: 80% of your weekly running

Zone 3: Moderate (Tempo/Steady State)

• Purpose: Improve lactate clearance
• Feel: Comfortably hard, can speak in sentences
• When: Tempo runs, marathon pace work

Zone 4: Threshold (Hard)

• Purpose: Raise lactate threshold
• Feel: Hard, can only speak a few words
• When: Threshold intervals, tempo repeats

Zone 5: VO2max (Very Hard)

• Purpose: Improve oxygen uptake capacity
• Feel: Very hard, can't speak
• When: Track intervals, 5K-specific work

How This Calculator Works

This calculator uses your recent race performance to estimate your threshold pace, then derives all training zones from that baseline. The calculations are based on Jack Daniels' VDOT methodology, widely considered the gold standard for running pace calculations.

Tips for Best Results

1. Use a recent effort - Ideally within the last 4-6 weeks
2. Choose an all-out race - Time trials work too if truly maximal
3. Account for conditions - Hot weather or hilly courses affect times
4. Retest periodically - Zones should update as fitness improves