SECOND NATURE LISTENER EXCLUSIVE
Power. Heart rate. Sleep score. HRV.
UV Load.
Welcome, Second Nature listeners - we’re thrilled to offer you a preview of Pelotan’s UV Load™ app. UV Load reads every outdoor session from Strava and gives you a score on a 0 to 100 scale. Built with Grand Tour teams and IRONMAN champions over the past 18 months, this is the missing part of every athlete’s training protocol. Sign up to get immediate beta access today, and save 20% off your next Pelotan order.
Join the UV Load early-access waitlist
NO SPAM · LAUNCHING JUNE 2026 · iOS & ANDROID
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WHY UV LOAD
Sun exposure is a performance variable. Now it has a number.
You measure power. Heart rate. Sleep. You don't measure UV. Sun exposure isn't a health footnote — it's a performance variable. It accelerates fatigue, impairs sweat efficiency, raises core temperature, and disrupts recovery. The UV Index gives you a single point in time, while UV Load™ gives you the cumulative number that actually matters, both per-session, and cumulatively - explaning what that exposure is doing to your performance and recovery.
When you measure UV Load, you can adapt for it.We've been building and testing UV Load with our elite athlete roster for over a year - it has been shaped in Grand Tours, IRONMAN races, ultra-marathons and the kind of sustained, high-exposure racing blocks that push athletes to their limits.
Calibrated against ARPANSA risk thresholds. Anchored to peer-reviewed exercise physiology. UV Load™ is a measurement, not a marketing claim.The performance and testing programme was led by Dr. David Lipman former Director of Applied Science at Supersapiens, host of the Norwegian Method podcast.
Over all this testing, we have validated the algorithm that would become UV Load™. And you can be the first to understand it for yourself with the UV Load™ by Pelotan app which launches shortly for iOS and Android.
HOW IT WORKS
Three steps, one score.
Connect Strava
Sign in, authorize Strava once. The UV Load™ app automatically picks up each new outdoor activity, plus those in the last 5 days to help build your baseline.
We do the math
For each session we fuse your route and a data stack including the hour-by-hour UV index, cloud cover and elevation into a single UV Load™ score from 0–100. Think of it as a Whoop strain score but for UV exposure.
Know your dose
See per-session impact and weekly cumulative strain with a push notification the moment a new activity is analysed.
Track your performance and recovery with the full picture.
WHAT YOU SEE
The feed you already use. Now scored for UV.
ACTIVITY FEED
Every session, scored.
Your home screen opens with today's headline load. Scroll down for the full feed — Strava-synced, map included, each activity scored from Negligible to Extreme.
- Per-session UV Load™ from 0–100
- Auto-synced from Strava — race, training or any outdoor activity
- Route, weather and duration on one card
ACTIVITY DETAIL
Data, not vibes.
Tap any activity to unpack the full picture: average UV index across your actual route, cloud cover on the day, temperature, and the numeric UV Load explaining how it hit you and how to mitigate the effects.
- Share your UV Load data
- Hourly UV strain curve through the session
- Colour-matched to your result
CUMULATIVE STRAIN
Zoom out to see the impact.
You measure power and adapt training. You measure HRV and adapt recovery. The rolling 7-day UV Load is the same logic, one week at a time. Watch the number through the week and the decisions get specific. When the load climbs, you reapply earlier, you move the mid-day ride, you swap short sleeves for long. When it drops, you stop worrying about it. Track your performance and recovery with the full picture.
If nothing else, you'll know why some days you feel more cooked than others!
- Rolling 7-day UV Load vs. prior week
- Week-at-a-glance band-coloured dots
- Daily bars show when load actually spiked
WRITES BACK TO STRAVA
We auto-update your Strava description with the numbers that matter.
Finish a session — Pelotan analyses it, writes a clean UV Load summary into your Strava activity description, and pings you.
- UV Load score, band and avg UV index — all appended automatically
- You keep the original description; we add a Pelotan block underneath
- Toggle on/off per activity type
Coastal long session
- Distance68.4 km
- Time2h 42m
- Elev612 m
── pelotan.cc/uv UV Load™ Analysis ── UV Load 91 — Serious Avg UV 7.8 🌡️ 27°C ☁️ 5%
THE SCIENCE
Generic UV apps look at your zip code.
We look at the 4 hours 32 minutes you spent outdoors.
UV Index × Duration
The UV forecast from your actual GPS track, from the moment you start moving, to the moment you stop. Not a single reading from a generic city-wide weather API.
Cloud & Elevation
Cloud cover and altitude both change how much UV reaches your skin. We weight both, because a cloudy 2000m col still takes a performance toll.
Cumulative Load
Single sessions rarely do the damage — weeks of moderate exposure do. Pelotan rolls 7 days of dose into one comparable number, with a 30 day view for the racing season.
Science Foundation, Race Proven
Calibrated against ARPANSA risk thresholds, and anchored to peer-reviewed exercise physiology. UV Load™ is a measurement, not a marketing claim.
UV Load™ is a training-load–style metric we developed. Not medical advice.
trusted by the best in the world
JOIN THE BETA
Ready to understand your UV Load?
Get your Second Nature early access and offer today!
Join the UV Load early-access waitlist
FAQ
The usual questions.
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Yes — Pelotan is a companion layer on top of Strava. After you sign in we ask you to authorize Strava once; from then on activities flow in automatically via webhook. We never ask for your Strava password.
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No. UV Load™ is a fitness-style metric designed to help athletes make their own informed decisions about sun exposure. We surface the numbers — your dermatologist still gets to decide what protection you actually need.
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The beta is free for everyone on the waitlist.
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The maths works for any outdoor GPS activity Strava captures — cyclists, runners, trail runners, hikers, skiers, paddlers, sailors. Every activity type Strava supports shows a score.