strive.ai samples your fitness to enable our anlaytics and to offer you feedback on your progression.
We collect 3 types of fitness metrics depending on the sensors you use and activity types you participate in. The more sensors you train with, the more value you'll get from strive.ai! You can see a summary of your current fitness anytime on your home page.
Peaks: We calculate the peak average heartrate, bike power and run power over 10 time durations [30s, 1-5m, 10m, 15m, 20m, 60m] during each activity. These values represent your peak fitness for each activity and they're captured when present on an activity.
Best Efforts: We calcualte your peak running pace over 5 distance [400m, 800m, 1600m, 5k, 10k] for each run.
Segment Efforts: We capture your watts/kg on every segment effort done with power (Rides and Runs).
Focus: We ask you select which time durations or distances you'd like focus on. These settings allow you to see trends and recieve insights related to those peaks or best efforts.
In addition to the above we do a few more things for athletes that train with power:
TrainingPeaks Metrics: We calculate your Normalized Power (NP), Intensity Factor (IF), Training Stress Score (TSS) and Fatique (ATL) on each activity with power (Ride, VirtualRide, Run or VirtualRun). More information here. Currently we use the same formula for both cycling and running. We MAY move to TP's rTSS once we can predictably compute Grade Adjusted Pace using the same formula TP uses. Additionally, we're going to start calculating Stryd's RSS variable soon since they've made efforts to publish their formula more broadly.
Power Curve: In addition to the peak thresholds we also capture a power curve for each activitiy done with a power meter (Rides and Runs). Our power curve samples every 5 seconds up to a minute and then every minute up to 60 minutes. Our power curve isn't at the same fidelity, nor duration as Strava or TrainingPeaks but it's the same concept.
Estimated FTP: We estimate your Functional Threshold by looking for the max observed peak within the Fitness Window (last 8 weeks). For example, for run and bike power we estimate it using 95% of your peak 20min watts from the last 8 weeks. For heartrate we use the peak 60min sample. We're working out how we'll address run pace threshold as their are several schools of thought.