Zone 2 Training: Building Your Aerobic Base

Zone 2 work trains your aerobic system without burying you in fatigue. It improves mitochondrial density, fat oxidation, and durability — the invisible engine behind every strong finish.

A practical rule: if you cannot speak in full sentences, you are likely above Zone 2. Keep most weekly volume easy, then add intensity where it matters.

"Consistency beats hero weeks. Aerobic fitness is built in months, not single sessions."

— Prep Coaching Team

How to structure a Zone 2 week

• Aim for 3–5 easy sessions where breathing stays conversational.
• Use a mix of durations: short frequent runs and one longer steady effort.
• Track drift: if heart rate climbs at the same pace, you are creeping out of Zone 2.
• Pair nutrition with duration: fuel longer Zone 2 sessions like race-relevant efforts.

Prep helps you align fueling with your training distribution so easy days stay truly easy — and hard days have room to work.