What is Lactate Training? | Sports Science Without Lab Testing
Science-led endurance training. No lab required.
Lactate Training is an AI-powered endurance training and coaching app—not a blood-testing service. It takes the data you already collect, helps you understand your training zones and turns sport science into better everyday training decisions.
Your life. Your data. Your training. Built for normal people with work, family and goals that matter.
Why lactate matters
Lactate isn't just a sign of hard exercise. How your body produces, transports and uses lactate is part of endurance performance. Training at appropriate intensities helps develop aerobic fitness and the ability to sustain effort. But you don't need to take blood to train intelligently.
Lactate Training uses available heart-rate, pace, power, workout history and feedback to help estimate training zones, understand intensity, compare sessions and plan what comes next. You can use optional blood lactate test results if you have them, but the app does not measure blood lactate or directly measure lactate metabolism without a test. Zone estimates are guidance, not lab measurements.
The technology of endurance coaching, for everyday athletes
Whether you're just getting started, training for your first event or chasing a personal best, your training needs to fit your life. Work, family, commitments, tired days and changing plans are part of the picture—not things your training should ignore.
Connect Garmin or Strava when eligible, tell your coach what you're working towards, and make sense of your training zones, sessions, fitness and recovery using practical sports science. You can start with the data you already record. No blood test required. Testing is only an optional extra for athletes who have results to add.
What does the app actually do?
- Understands your training. Review sessions, pace, heart rate, power where available, training history, and supported health and recovery data. See what went well and what might need changing.
- Helps plan what comes next. Build training plans around your goals, the time you have and your preferences. Your calendar isn't a fixed document—it's yours to change.
- Coaches you through everyday decisions. Ask questions, check in, compare workouts and use coaching memory so recommendations can reflect your own context.
- Connects with tools you already use. Paid plans include unlimited WhatsApp coaching messages and the option to use Claude or ChatGPT with a connector that can read and, with edit access, make supported changes to your calendar and coaching information.
Meet Auto Coach: apply the science to your next session
Auto Coach uses your training context to help plan and adjust future sessions rather than leaving you with a rigid schedule. It works from your goals, recent training, availability, rules and feedback to suggest practical adjustments: when to build, when to ease off and how to fit training around your actual week. It is a coaching tool, not a lab test or an infallible prediction of fitness.
Busy week? Unexpected rest day? Only 40 minutes available? Tell Auto Coach. You can see proposed session changes and the reasoning behind them, and choose how much control to give it: I'll apply, Ask me or Full auto. Its current planning flow may still ask you to extend the plan when it runs short.
How Auto Coach works and how to set it up →
Built independently. Shaped by the people using it.
Hi, I'm Barney. I started Lactate Training as a self-funded startup while working full-time, raising a family and trying to make my own training fit around everything else.
I've spent years training and looking at the numbers. I wanted the insight of a good coach without needing to make training another full-time job. So I started building an app that makes data and sports science more practical, personal and accessible.
We're a small, independent business. Your ideas, bug reports and feedback really matter because they help decide what gets built and improved next. This is designed around your life, your data and your goals.
Read our founder story → · Tell us what you'd improve →
Start with 30 days of Pro free
Eligible new athletes get 30 days of Pro-level app features free, with no payment details and no automatic paid subscription afterward. Then choose Basic for £4.99/month, a higher plan if you need more AI usage, or stay on Free. WhatsApp coaching is available in the trial; the external Claude/ChatGPT connector requires a paid Lactate Training plan.