From zones to a daily plan
Meet Coach Kalle
These calculators give you the zones. Coach Kalle tells you what to do in them today, and why. An AI endurance and strength coach that reads your real training and health data and writes your session each day.
A coach that thinks with your data
Knowing your zones is the start. The hard part is the daily decision: easy or hard today, how long, which system. Coach Kalle pulls your real numbers and prescribes the next session with the reasoning laid out.
Encouraging, rigorous, never hype. Kalle proposes, you decide, and it learns from what you do.
How it works
Reads your real data
Kalle connects to your training and health data: sessions, heart-rate variability, resting heart rate, sleep, recent load.
Prescribes today's session
Each day you get a specific workout: sport, structure, target zones (the ones these calculators produce), and the physiological reason behind it.
Logs prescribed vs actual
Kalle compares what it asked for with what you did and analyses the gap, so the plan reflects your real training.
Learns over time
Every session, check-in and race sharpens the model of you. The coaching gets more personal over time.
Start free, right here
Set your zones with the free calculators first. If you then want a daily plan built on them, Kalle is the next step.
Frequently asked questions
How is Coach Kalle different from these free calculators?
The calculators are static: numbers in, zones out. Coach Kalle uses those zones to prescribe what to do each day, accounts for fatigue and life, logs what happened, and adjusts.
What sports does Coach Kalle cover?
Coach Kalle covers endurance and strength: road and trail running, cycling, triathlon, swimming and gym-based strength work, blended into one plan instead of two separate worlds.
Do I have to pay to use the calculators?
No. Every calculator on TrainingZones is free forever, with no signup and no email wall. Coach Kalle is the optional paid step for athletes who want a daily plan on top of the zones.