Smart coaching platforms track dozens of metrics — but not all of them are equally actionable. Some are background information; others are the core data points that should directly inform every training decision you make. Here are the metrics that matter most for cyclists using an AI or data-driven coaching platform, and why each one earns its place on that list.
FTP (Functional Threshold Power)
FTP is the anchor of power-based training. It’s the highest average power you can sustain for approximately one hour, and it’s the reference point from which all training zones are calculated. Every structured workout your platform prescribes — from Zone 2 endurance to VO2 max intervals — is expressed as a percentage of your FTP. An outdated or inaccurate FTP makes every zone target wrong, which is why regular testing matters. Understanding what FTP is and how to improve it is foundational to using any smart coaching platform effectively.
TSS (Training Stress Score)
TSS quantifies the total training load from a single session by combining duration and intensity relative to your FTP. A one-hour ride at FTP produces a TSS of approximately 100 points. An easy two-hour recovery spin might produce 60. A hard threshold session might produce 120. TSS lets your platform compare the cost of very different sessions on a single scale and accumulate load over time in a meaningful way. Learning how TSS works gives you the ability to read your own training load with precision.
CTL (Chronic Training Load) and ATL (Acute Training Load)
CTL represents your long-term fitness base — the exponentially weighted average of your TSS over approximately 42 days. ATL captures recent fatigue — the same average over approximately 7 days. Together with TSB (the difference between them, representing form), these three metrics form the Performance Management Chart that smart platforms use to manage your training progression. Understanding ATL, CTL, and TSB is one of the most valuable analytical skills a data-driven cyclist can develop.
W/kg (Watts per Kilogram)
Raw wattage tells you how much power you’re producing; W/kg tells you how that power relates to your body weight — which is what actually determines performance on climbs and in most competitive contexts. A 300W FTP means very different things on a 60kg rider versus a 90kg rider. W/kg is the universal language of cycling performance comparison, and it’s the metric smart coaches use to set realistic performance benchmarks and identify where the biggest gains are available — often through a combination of power improvement and weight management.
HRV (Heart Rate Variability)
HRV gives your smart platform a daily window into your nervous system’s recovery state. When HRV is suppressed relative to your baseline, the platform knows to reduce training intensity or prescribe recovery rather than proceeding with planned hard work. When HRV is elevated, it signals readiness to push harder. This physiological input is what allows the best platforms to move beyond load-based adaptation into genuine readiness-based personalisation. HRV for cycling recovery is increasingly central to how adaptive platforms make daily training decisions.
Normalised Power and Intensity Factor
Normalised Power accounts for the metabolic cost of variable-intensity riding — making it a more accurate reflection of workout difficulty than average power alone. Intensity Factor (IF) divides your Normalised Power by your FTP to express how hard a ride was relative to your threshold. These two metrics help your coaching platform interpret ride data accurately and calculate TSS correctly — which in turn drives all the load management decisions that follow.
The Bottom Line
For cyclists using a smart coaching platform, FTP, TSS, CTL/ATL/TSB, W/kg, HRV, and Normalised Power form the core analytical toolkit. Understand what each metric measures, how it’s calculated, and what changes in it mean for your training — and you’ll be able to have a genuinely informed dialogue with your coaching platform about how your training is progressing.