When Tuesday goes sideways
Late meeting? Tell your coach how much time you’ve got. Review a shorter session or move it to a day that works.
Made for real life
Less guesswork. More legendary training.
Your watch knows your splits. You know you squeezed that run in before the school gates opened. Put the two together. Lactate Training uses your pace, heart rate or power, plus how it felt, to help you plan the next session.
30 days of Pro free · No card needed · No automatic charge · Basic from £4.99/month
Set up unlimited WhatsApp & edit-access Claude/ChatGPT →
Works withGarminStrava
Inside the app
What are your legs trying to tell you?
Find your easy gear
Take the hill at a pace where you can still chat. Check your heart rate afterwards to see how much extra work the climb asked of you.
Race your past self
Pull up two rides on the same loop. Compare power and heart rate side by side. On a windy day, speed only tells half the story.
Where do my training zones come from?
A zone is a range of effort. Lactate Training estimates yours from the training data you already collect. On a steady run, check how your breathing feels alongside the heart rate on your watch. A blood lactate reading takes a separate test.
How Lactate Training worksInside a session review
Six reps. What did the last two tell you?
The splits look tidy. The last rep felt anything but. Here’s how a runner and their coach might read the same session together.
Session Analysis
Example session review
Tuesday’s threshold intervals
Example run · 6 × 4 minutes · 52 minutes total
All six reps landed at the same pace. That’s four seconds per kilometre quicker than the same set six weeks ago.
Heart rate crept up on reps five and six. Was it warmer today? Did the last two feel harder? Add that detail while you remember.
Thursday is an easy run. Pick the route where you can chat all the way home and save the pace target for the next interval day.
Auto Coach
Long run on Sunday. Family lunch at noon.
Tell Auto Coach when you need to be home, what you’re training for and how your legs felt this week. It uses your recent sessions and feedback to suggest a long run that fits.
You choose how much help you want. Make the edits yourself, approve suggestions as they come in, or choose Full auto.
How Auto Coach works →
Give your coach the whole picture
- Tell it your goal. A first 5K, a faster marathon, or simply consistent training.
- Set your constraints. Work, family, available days, recovery and preferences.
- Review your plan. Adjust future sessions when time or circumstances change.
- Learn from each session. Add feedback and see why Auto Coach suggests changes.
Connected coaching
Talk it through with your coach
Try asking, “Can we move Thursday’s ride to Friday?” With edit access, Claude or ChatGPT can change a future session on your training calendar. For a quick post-run check-in, message your coach on WhatsApp.
WhatsApp · Available during your free trial and on paid plans
Unlimited coaching in WhatsApp
Ask questions, check in or report how a session went, straight from WhatsApp. Coaching messages don't use your in-app question/report allowance.
- Open WhatsApp AI Chat on the Lactate Training homepage in the app.
- Enter your WhatsApp number and tap Link my WhatsApp.
- When linked, tap Open WhatsApp chat and send your first message.
MCP integration · Basic, Pro and Max
Claude & ChatGPT: view AND edit
Your connected AI can go beyond reading session and Garmin health data: edit future workouts and plans, manage calendar and coaching information, and update your memory and coaching preferences through supported actions.
- In the app, go to Settings → Claude and ChatGPT integration.
- Select Create edit link (not the read-only link), then copy it.
- Add the link as a custom connector in Claude or an app/connector in ChatGPT, then ask it to make a change.
Important: WhatsApp coaching is available during the eligible 30-day free trial. Claude/ChatGPT MCP editing requires an active paid Lactate Training plan, starting with Basic at £4.99/month; any external Claude/ChatGPT subscription is separate. Always review edits made through an AI connector.
Meet Barney
Why I built Lactate Training
I'm Barney. I'm a runner, a dad of two and I work full-time. I started Lactate Training because data and sports science shouldn't be reserved for professionals or people with a lab.
We're an independent, self-funded startup, building something useful for people with jobs, families and goals. Your ideas and feedback genuinely shape what comes next.
Real reviews
Not sure it works? Hear from real athletes.
Awesome App for every level of athlete. It links to your Garmin data seamlessly and helps to break down all of the data it...
Read full review
Awesome App for every level of athlete. It links to your Garmin data seamlessly and helps to break down all of the data it chucks out, giving you a deep layer of insight after every session. Its like having a coach at your disposal whenever you need it. im currently smashing my goals due to this App.
I always considered having a coach, but I’m not committed enough to invest in that. This app is perfect in the absence of a...
Read full review
I always considered having a coach, but I’m not committed enough to invest in that. This app is perfect in the absence of a coach.
I’ve found this app super helpful for structuring my run training. It gives way more detail and 2-way interface than competitors such as Runna...
Read full review
I’ve found this app super helpful for structuring my run training. It gives way more detail and 2-way interface than competitors such as Runna (which I think is good for beginners but is so limited). I thoroughly recommend to anyone wanting support with their training. I guarantee you’ll see progress.
30 days of Pro FREE · No payment details
Try Pro free for 30 days. Keep Basic for £4.99.
Basic includes unlimited WhatsApp coaching, AI session analysis, Auto Coach and the ability to view and edit your data, future sessions, questionnaires, memory and coaching style through Claude or ChatGPT. More AI usage with Pro or Max.
30 days of Pro free. No card. No automatic charge.
After your trial, choose Basic for £4.99/month with unlimited WhatsApp coaching, upgrade for higher AI limits, or stay on Free. See all plan details.
Register for WhatsApp during your trial, or activate Claude/ChatGPT MCP editing once you're on a paid plan.
Compare all plans, features & monthly limits →
Free, Basic, Pro and Max — full breakdown with every allowance
Free
£0/month
Keep your training organised with a small free AI allowance. No payment details.
- Training calendar and planning
- 2 AI coach questions each month
- 2 AI reports each month
See all features
- 2 daily check-in responses each month
- New Garmin/Strava connections require a trial or paid plan
Basic
£4.99/month
Most coaching features. Unlimited WhatsApp. £4.99/month after the free trial.
- Unlimited WhatsApp coaching messages
- View and edit training with Claude & ChatGPT
- Auto Coach, session analysis, dashboard and memory
See all features
- 50 coach questions and reports combined/month
- Edit future sessions, questionnaires and coaching style
- Lite and Legend training plans
- Grill Me (15/month)
- Send Garmin workouts (8/month)
- Talk to your coach (4 conversations/month)
- Session comparisons and weather
- Training insights and health views
- Manage your training calendar
- Automatic session names and short summaries
- Daily AI check-ins (31/month)
Pro
£9.99/month
All Basic features with higher monthly AI limits. £9.99/month.
- Everything in Basic, including unlimited WhatsApp
- View and edit data via Claude or ChatGPT
- 50 coach questions and 50 reports each month (separate)
See all features
- Auto Coach: 30 plan builds/rebuilds/month
- Grill Me: 60/month
- Send workouts to Garmin: 31/month
- Live voice: 15 minutes/day
- Lite plans: 10/month; Legend plans: 10/month
- Session comparison, dashboard and weather
Max
£14.99/month
Highest usage limits plus Coach Mode for managing athletes. £14.99/month.
- Everything in Pro, including unlimited WhatsApp
- View and edit training with Claude or ChatGPT
- 1,000 coach questions and 1,000 reports/month (separate)
See all features
- Coach Mode: manage connected athletes
- Auto Coach: 60 plan builds/rebuilds/month
- Grill Me: 120/month
- Send workouts to Garmin: 100/month
- Live voice: 30 minutes/day
- Lite plans: 20/month; Legend plans: 20/month
Compare all features, voice limits and monthly allowances
Cancellations, refunds & contact · Set up WhatsApp · Set up Claude/ChatGPT edit-access MCP
Still got questions?
How does the 30-day trial work?
Eligible new athletes get 30 days of Pro-level app features free, with no payment details and no automatic charge. When the trial ends, choose Basic for £4.99/month, Pro, Max or remain on Free. External Claude/ChatGPT integration requires a paid plan.
What if my session analysis shows an error?
Hit Refresh, then report the problem. A failed analysis does not use your monthly AI report allowance. Email barney@lactatetraining.ai if it continues.
How do I cancel, request a refund or contact Barney?
No card is required for the free trial. After subscribing, you can cancel through Apple or Google. See our Cancellations, Refunds & Contact page, or email barney@lactatetraining.ai.
What sports does Lactate Training support?
The app is built for endurance training, including running, cycling and triathlon. Ask us if you are unsure about your sport.
What devices and apps does it sync with?
Connect Garmin or Strava. Other devices can provide activities through Strava where that route is supported. The data available depends on your device and permissions.
Less guesswork. More legendary training.
Get the app, create your account and try 30 days of Pro free. No card needed. Cancel any time.
30 days of Pro free · No card needed · No automatic charge · Basic from £4.99/month