Run, bike & swim tests
Stepped lactate field tests per discipline with full history, search and reports.
Testing & analysis software for Champions
The software that builds champions.
Built by a multiple-time Ironman world champion who now coaches others to the top. Lactasoft is the complete coaching app for triathlon, swimming, cycling and running, for coaches and athletes alike. Free for everyone, in every language on earth.
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Built on proven performance
Ironman World Champion
World-renowned coach
Mader science
Field testing & lactate
Field tests
On the track, the road & in the water
Testing & analysis
Every test you ever did with Luc, fully analysed.
No lab, but real field tests in realistic conditions. All run, bike and swim tests are automatically turned into usable insights and training zones.
- Training zones, accurately calculated from your lactate curve.
- VO2max & VLamax, your aerobic and anaerobic engine mapped out.
- Mader simulations: mVO2max & mVLamax based on the Mader model.
- Evolution, see your progress test after test, year after year.
One complete package
Everything built into the app today.
Lactasoft is not a single tool but a full coaching platform. Field tests, training plans, wearable data, wellness, messaging and reports for coaches and athletes, all in one place.
Testing & analysis
Every field test, fully analysed
Run, bike and swim field tests with lactate curves, thresholds, zones and longitudinal evolution. No lab, real conditions.
Lactate curves & zones
VD and OP thresholds, training paces by phase, power zones and volume charts.
VO2max & VLamax
Aerobic and anaerobic capacity, standalone VLamax tests and history per discipline.
Mader simulations
mVO2max, mVLamax and ratio from optional Mader steps in run and swim tests.
Evolution
Compare tests over time, set a reference test, track deltas across all key metrics.
PDF, print & email
Export test reports, evolution reports and VLamax reports per discipline.
Training & calendar
From plan to execution
Auto-generated training plans from intake, calendar management, wearable import and plan-vs-actual tracking.
Coaching calendar
Week, month and list views with run, bike and swim session types, race markers and drag-and-drop.
Auto-generated plans
Training plans built from coaching intake: race goal, phase, availability and athlete type.
Wearable import
Import activities from all major wearables, including Garmin. Upload TCX, FIT and GPX files with activity detail and lap charts.
Plan vs actual
Link imported activities to planned sessions. Track compliance, missed sessions and extras.
Training log
RPE, feeling, notes, wellness trends, sRPE load, volume charts and CSV export.
Team training log
Coach overview per athlete with open logs, high-RPE alerts and coach notes.
Health & wellness
Stay healthy and injury free
Daily check-ins, injury history and load monitoring keep training and recovery in balance.
Daily wellness check-in
Sleep, soreness, energy, mood, sick flag and pain/injury tracking with 14-day trends.
Health history
Coaches see sick and injury episodes aggregated over 12, 24 or 60 months.
Injury prevention context
Past injuries in coaching intake, overload signals via RPE and wellness data.
Communication
Always connected
Direct messaging between athletes and coaches, per training or general, with urgent alerts.
Team messages
Coach inbox with filters for unread, urgent, context type and athlete search.
Athlete messaging
General questions and per-training threads, with urgent flag and email notifications.
Coaching intake
Race goals, availability, injury history, volume history and coach notes in structured sections.
For coaches
Head coach & delegated coaches
Full control over athletes, tests, plans and communication.
- Athlete management with profiles, groups, goals and multi-coach assignment
- Global test overview with filters, KPIs and dashboard trend charts
- Coaching calendar with auto-plans, phase tracking and volume summaries
- Portal account setup for athletes with language preference and credentials email
- Setup & admin for groups, goals, coach accounts and login log
For athletes
Personal athlete portal
Your data, your plan, your progress. Free and in your language.
- Personal dashboard with today's training, action items and race countdown
- View all your tests and evolution reports from every field test with Luc
- Training calendar read-only with phase, zones and executed session detail
- Wearable upload from all major devices and training log with RPE, feeling and wellness check-in
- Messages to your coach including urgent alerts and per-training threads
Also included: progressive web app for mobile, dark/light theme and the app works in every language on earth.
62.4VO2max (ml/kg/min)
0.42VLamax (mmol/l/s)
4.1W/kg threshold
+7%vs previous test
Training zones (heart rate)
Recovery
Endurance
Tempo
Threshold
VO2max
Evolution VO2max & VLamax
The app
Your complete performance profile at a glance.
From training zones and threshold values to the simulations from the Mader model. Everything that is scientifically calculated behind the scenes, shown clearly and visually.
- Interactive charts for every test and discipline.
- Mader VO2max (mVO2max) and VLamax (mVLamax) simulations.
- Compare tests across the years and see your growth.
Ironman
World champion & coach
Luc Van Lierde
The science and experience of a true champion.
Luc has worked with the Mader model since the early '90s. Together we integrated that science into software he uses to guide his athletes, analyse tests and build training programs.
Now he shares that package with everyone who tests at Luc Van Lierde Coaching, so every athlete and coach can work with the same tools that make world champions.
2×Ironman World Champion, Hawaii
7:50:27Ironman world record, unbeaten for 14 years
30+ yrsracing & coaching at the top
Everything in this app comes from real races and from coaching people who win. That is the only foundation that counts. Luc Van Lierde
Worldwide field testing
Bring Luc Van Lierde's field tests to your country.
Luc Van Lierde Coaching travels the world to run lactate field tests for athletes of every level. Luc regularly visits training destinations across the globe to test on the running track, in the pool and on the athlete's own bike mounted on a power meter, right where athletes live and train.
Coaches, clubs and groups can request an on-location lactate testing session. Gather your athletes, choose your dates, and get the same testing and analysis that builds champions, delivered locally and fed straight into the app.
Thailand
Morocco
Dubai
Turkey
Israel
Mexico
Lanzarote
and more
A dedicated page with full details and booking is coming soon.
Every continent
Field testing on location
Our philosophy
Great coaching should never sit behind a paywall.
Talent and hard work deserve the best tools. Not only for those with money, or those who happen to live where English is the norm. Keeping Lactasoft free is not an extra, it is the foundation.
Free is the foundation
An athlete just starting out or a coach running a small group gets exactly the same possibilities as a professional team. Money no longer decides who can train smarter or coach better.
Every language, every region
A swimmer in Asia or a runner in South America uses the same app as someone in the Netherlands or the United States. Sport is global, so the app is too. Every language gets a professional translation, activated even for a single user.
Everything in one system
Plans built around your level, goals, time and recovery. Data from watches, sensors and apps explained in plain language. Sleep, nutrition and recovery, room for mental training, technique video feedback and a community. All in one place, no switching between apps.
Straight from real racing
A plan alone is not enough. You have to see the body, the data, the mind and daily life together. Everything in the app comes from real races and from coaching people who win. That is the only foundation that counts.
The goal is simple: make sport more open, so more people can train smarter, prevent injuries and enjoy it longer, without language or cost getting in the way.
Borderless
Every language.
There is no language on earth in which the app does not work.
Sport is global, so the app is too. Every language gets a professional translation, activated even when you are the only user in that language. A glimpse of what is possible:
Who is it for?
Free for everyone.
Available on simple request, and automatically for anyone who ever tested at Luc Van Lierde Coaching, everyone they refer, and above all their coaches.
Athletes who tested with Luc
Did you ever do at least one test with Luc? Then the full app is available to you.
Coaches with tested athletes
Do you coach athletes who have tested with Luc? Then you get access to their guidance and data.
Athletes who grant their coach access
As an athlete you easily grant your coach access to your coaching app or online application.
100% free for coaches and athletes, also available on simple request
Community
A forum for questions, ideas and discussion.
A public area for everyone, and a members-only area for app users. Ask questions, share experiences and help shape the software.
Completely free
Train like a champion.
Join the athletes and coaches of Luc Van Lierde Coaching and use the software that makes proven champions.