Zone 2 Training

Zone 2 is a sustainable aerobic intensity used to build endurance. Use the calculator to find your Zone 2 range, then validate it with perceived effort.

How to stay in Zone 2 (practical tips)

Zone 2 should feel controlled. If you keep creeping above the range, slow down—your ego will adapt, your aerobic base will improve.

Common reasons Zone 2 feels too hard

  • Heat & humidity: heart rate rises for the same pace.
  • Dehydration: can increase cardiac drift.
  • Starting too fast: even small early surges can push HR up later.
  • Bad sleep / stress: shifts your baseline.

Helpful companions

Zone 2 FAQ

Q:What does Zone 2 feel like?

It should feel sustainable and controlled—easy enough to hold a conversation in short sentences. If it feels like a hard effort, you’re probably above Zone 2.

Q:Should I use pace or heart rate for Zone 2?

Heart rate is usually the better constraint because pace varies with hills, heat, and fatigue. Use pace as a secondary check and keep effort consistent.