Find the line.
Train either side of it.

Know exactly where fatigue starts to build and which paces you can hold for hours.

Your Lactate Profile

See the test in action

“Most people are surprised where their LT1 actually sits. They are often overestimating it in their training.”

What happens during the test

You run or ride at progressively harder efforts, pausing briefly between each stage for a small fingertip or ear lobe blood sample. Each sample shows your lactate level at that effort. We build a full profile, your personal lactate curve, that maps exactly how your body responds to increasing intensity.

What your report includes

Full Lactate Profile Graph – your complete curve across all intensities

LT1 – Aerobic Threshold – the top of your sustainable, all-day zone (with pace & heart rate)

LT2 – Anaerobic Threshold – the line beyond which fatigue builds fast (with pace & heart rate)

Heart Rate & Paces Across Zones – training zones derived from your actual lactate data

Test Breakdown by Step – HR, lactate reading, pace and speed at every stage

Follow up Review – we go through what the curve means and how to train to it

Your lactate curve

LT1 · Aerobic LT2 · Anaerobic Lactate (mmol/L)

Easy pace

Threshold

Max effort

Illustrative example, your actual curve is built from your own readings.

Why this is different from estimated zones

Generic training zones

Your lactate zones

Where this test is especially useful

Knowing your marathon pace

Establishing your LT2 pace and critical speed is a super helpful guide for maintaining effort in marathons and identifying the best pace you can hold for the distance.

What feels easy might not be.

LT1 defines where lactate starts to build. Training below this level the majority of the time will help you stay fresher, recover faster and have the reserves you need to push in harder sessions.

You are going long distances

If your event is an ultra run, Ironman or long bike ride then knowing your LT1 level helps define the upper ceiling of effort you can sustain on race day and still power to the finish.