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. It's an AI endurance & 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, not the finish. The hard part is the daily decision: easy or hard today? How long? Which system? Coach Kalle is built to answer exactly that, an AI coach that pulls your real numbers and prescribes the next session with the reasoning laid out, the way a good human coach would explain it.
It's athlete-to-athlete: encouraging first, rigorous always, never hype. You stay in control, Kalle proposes, you decide, and it learns from what you actually 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) instead of guessing from a static template.
Prescribes today's session
Each day you get a specific workout: the sport, the structure, the target zones (the same ones these calculators produce), and the physiological reason behind it.
Logs prescribed vs actual
Kalle compares what it asked for against what you actually did, then analyses the gap, so the plan reflects your real training, not your intended one.
Learns over time
Every session, every check-in and every race sharpens the model of you. The coaching gets more personal the longer you train with it.
Start free, right here
You don't need Coach Kalle to get value from this site. Set your zones with the free calculators first, then, if you 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: you put numbers in, you get zones out. Coach Kalle is dynamic: it uses those same zones to prescribe what to actually do each day, accounts for your fatigue and life, logs what happened, and adjusts. The tools give you the map; Kalle helps you walk it.
What sports does Coach Kalle cover?
Endurance and strength: road and trail running, cycling, triathlon, swimming and gym-based strength work. It blends aerobic zone training with strength prescription in one plan, rather than treating them as 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 and a coach's judgement on top of the zones.