Blog
Training analysis, plainly explained
Stories behind trace, explanations of the key training metrics, and updates on new features.
Estimating VO₂max from training data: How the number on your watch is made
A straight line through heart rate and power, extended to maximum heart rate: that is how VO₂max is made without a lab. What the number can do, why HRmax decides everything and where the model stops.
Read moreCritical pace and running zones: Your threshold from everyday runs
No lactate test, no 30-minute time trial: critical pace comes from the hard stretches of your training runs. With a worked example, a zone table and the limits of the method.
02 September 2026
Carbs per hour: How much your body can really absorb
Pros ride on 120 g per hour, many amateurs on almost nothing. What science actually recommends depends mostly on one question: how long are you out there?
01 September 2026
HRV, resting heart rate, sleep: What your readiness score really tells you
HRV, resting heart rate and sleep are real signals, not wellness folklore. But a readiness score is an advisor, not a boss. What the values can do and where they miss.
22 August 2026
Detraining: How fast you really lose fitness and how to keep it
Short breaks are training, two weeks mostly cost blood volume, and only months of standstill get expensive. Detraining research is kinder than your fear.
11 August 2026
trace is now on the iPhone
Training doesn't happen at a desk. The most important answers from trace are now where they're needed: on your iPhone.
03 August 2026
How trace started: One platform instead of four tools
Generic AI summaries, cluttered interfaces, four tools for one training decision. The wish to unite all of that in one platform was the beginning of trace.
10 May 2026
Understanding Critical Power: What the CP curve reveals about your form
CP is more robust than FTP and more accessible than a step test. What the curve tells you and where its limits are.
08 May 2026
Training load explained: ATL, CTL and TSB without the jargon
Three abbreviations, one concept: how ATL, CTL and TSB connect and why your TSB shouldn't always be positive.
05 May 2026
Aerobic Efficiency: What watts per heartbeat really reveal
Same pulse, more watts: that's the most honest fitness indicator your sensor can deliver.
02 May 2026
Durability: The metric that separates amateurs from pros
Hour 5 decides the race, not minute 5. Why Durability is the most exciting development in modern training diagnostics.
28 April 2026
Update: The trace Coach, how it works and what it doesn't do
Not a generic chatbot, but a coach with full context on your values. What the trace Coach can do and what it deliberately doesn't.
22 April 2026