Your best 800 set in 8 weeks — and it built instead of fading. Reps got quicker as they went and form held; the speed came from a longer stride, not a higher pulse. In this heat it cost more than the splits show — a real threshold hit, so make tomorrow genuinely easy and let it land. Next quality day we tighten the rest jogs and stretch the reps.
Sextant's full read, in your coach's voicePRO
Talk it through, or hand it to your AI
Ask assistant ↗Ask your AI ↗
The narrated read is AI — sharp, but it can be wrong. The numbers above are measured; check any judgement that matters.
Awards4 earned · Share ↗
Season best
800m · 2:38
2nd 800m
rep 5 · 2:40
3rd 1K
reps 5–6
Set PR
6×800
Segments · 6 × 800mtap to open
GPS healthy · gps+streamoff-pattern · won't skew your fitness
Ask your coach, send it to your AI, or get the full breakdown
Ask assistant ↗Ask your AI ↗PRO
Heart rateoptical · ±5 bpm i
Apple Watch optical HR. Stated ±5 bpm vs. a chest strap; wider in the first ~30s of a hard rep. Lines: AeT 154 / AnT 172 (field test 2026-04-07). Band = this segment's target.
01234 mi
130150170190 bpm
PaceGPS · ±3 m i
GPS + speed, odometer-calibrated. ~±3 m open-sky; the curve is the better-calibrated of GPS vs. watch speed. Band = interval pace 5:00–5:14/km (from your fitness · Apr 7).
01234 mi
4:505:406:307:10/km
Cadenceaccel · ±2 spm i
Wrist accelerometer. ±2 spm typical. Target band 170–182 spm for I-pace at your height.
01234 mi
150165180195 spm
Form details — stride length, vertical oscillation▾
Stride lengthcomputed · pace ÷ cadence i
Derived, not measured. Stride = speed ÷ cadence, so it inherits GPS (±3 m) and cadence (±2 spm). A longer stride at steady cadence is the engine of a faster rep.
01234 mi
0.91.11.31.5 m
Vertical oscillationaccel · ±0.5 cm i
Wrist accelerometer. ±0.5 cm. Lower is more economical; band 6–9 cm is efficient for your pace. Bounce climbing late in a rep flags form breaking down.
01234 mi
581114 cm
Elevationbarometric · ±1 m i
Barometric altimeter. ±1 m relative. In distribution view this is grade — change per 100 m — not raw height, so flats and climbs separate.
01234 mi
−6%flat+6% grade
9:48Wi-Fi · 84%
‹sextantRACE
Riverside 10K
SUN · JUN 7 · 7:30 AM · 52°F CLEAR
42:18
PR−0:42Avg pace6:48Avg HR176
Medals earned3 this race · Share ↗
10K PR
42:18 · −0:42
Fastest mile
mi 6 · 6:38
5K split best
20:55
Add your finish & place — paste the results link, Sextant pulls it in.SOON
Distance
6.21 mi
Calories
648 kcal
Elev gain
+88 ft
Avg cadence
182 spm
WBGT
56°F
heat: low · air 52°F
Decoupling i
4.8%
held to the line
The readSextant · v3
The read
computed from this race
PR by 42 seconds — and you closed faster than you opened. That's a 10K run exactly right: held the threshold line the whole way and still had the legs to drop the last mile. Not much to touch on the race itself — the lever now is the long run before we aim this at the half.
Sextant's full read, in your coach's voicePRO
Talk it through, or hand it to your AI
Ask assistant ↗Ask your AI ↗
The narrated read is AI — sharp, but it can be wrong. The numbers above are measured; check any judgement that matters.
Heart rateavg 176 · max 189
0246.2 mi
Splitsnegative split · vs 6:48
1mi6:52+4
2mi6:50+2
3mi6:48—
4mi6:46−2
5mi6:44−4
6mi6:38−10
6:34Wi-Fi · 84%
‹sextant
800m400m1K1 mile5Ktempo
800m over time
12 efforts · season PR 2:38 · like-for-like
← scroll back through the season · faster is higher
See your whole season — Pro ↗
Free shows your last 30 days · Pro unlocks every effort
Jun 9 · Rep 6
your latest 800 — and the season best
Time
2:38
Pace
5:16/km
Avg HR
176 bpm
Cadence
178 spm
vs 8-wk line −4s · vs season start −14s · vs last 800 −2s
This 800 vs8-week median
This set8 weeksSeason1 yr ago
● this rep ●8-wk median
HEART RATE · AnT corridor
PACE · interval band
The read · 800m trend
12th 800 of the season · −14s vs season start · the gain is stride, not turnover.
Compare it across every run — in your own AI
Ask your AIPRO
6:34Wi-Fi · 84%
‹assistant
Your assistant is AI — sharp, but it can be wrong. For anything that matters — a niggle, a big plan change — loop in a real coach, too.
10K PR — 42 seconds off your best. You closed faster than you opened, even splits the whole way. That's a 10K run done right.
Riverside 10K · 42:18
PR −0:42 · negative split
HR climbed to your threshold line and held it the whole way.
Felt strong. Ready for a half in 6 weeks?
The fitness is there — the long run isn't. You're capped at 12 miles, and back in April you said healthy-first was the whole point. Six weeks is enough if we build it patient, not if we force it.
What do I focus on?
Two things, in order. Long run: add a mile a week to 16, all easy — in this heat that means genuinely slow. Then easy-day cadence — still dragging. Tighten it and durability follows.
Half-marathon · 6-week build
draft · tap to open in your plan
wk1 12mi long · 2×2mi tempo wk3 15mi long · 3×1mi tempo wk5 16mi long · sharpen wk6 race
Drafted. Easy days stay easy — that's where the durability comes from.
Unlock your coach — Pro ↗
Reads your whole history · remembers what you said
Unlock your coach to ask anything — ProAsk about your training…
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via your own private AI · your data stays yours
6:34Wi-Fi · 84%
‹sextant⚙
Alex
Masters · 142 runs · 1,040 mi this year
This weekWed · day 3 of 7
32/40 mi
8 mi to go · on track
Tempo ✓Interval ✓LongEasy ✓Easy
Calendar
‹June 2026›
5-day streak
M
T
W
T
F
S
S
EasyTempoIntervalLong
Current fitnessfield test · Apr 7
38FITNESS SCORE▲ +2 since Feb
≈ a sub-43:00 10K runner i
Aerobic · AeT
154 bpm
Anaerobic · AnT
172 bpm
Max HR
189 bpm
AeT = your easy-day ceiling · AnT = where threshold work lives. Stay under AeT on easy days.
Pace targetsfrom your fitness · per km
Easy
recovery · long
6:30
Marathon
steady
5:50
Threshold
tempo · cruise
5:34
Interval
VO₂ · 800s
5:05
Repetition
speed · 200–400s
4:43
Training loadTRIMP · 7d vs 28d
Steadysteady · −11% vs your month
10 wks agobuild blocknow
TRIMP = your heat- & HR-weighted load. The bands rise as fitness does — today's "steady" is more than spring's.
Ask the assistant about your training ↗
Personal recordsall-time
1 mi5:28PR
5K19:42PR
10K42:18PR · 3d ago
½ mar1:36:502025
Heat-acclimated · 14 runs > WBGT 80°F
Your coachhuman
Bring in a real coach
Share your runs and reports — they see exactly what you see. The AI is the ramp, not the replacement.
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6:34Wi-Fi · 84%
‹sextant
Share with your coach
Give your coach the same straight read on your training that you have — every run, in one place.
What your coach gets
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Every run, with the same reads and provenance you see.
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Your trends, PRs, and segment comparisons — like-for-like over time.
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A coach view across every athlete they train, in one place.
You control access — revoke any time. A coach reviews; they can't change your data. The AI is the ramp; a real coach is the destination.
6:34Wi-Fi · 84%
‹sextant
Share this
sextantJUN 9 · 2026
6×800 · INTERVALS
6/6
on target
Every rep landed inside your AnT corridor · 2:46 → 2:38, a negative set in the heat.
SEXTANT · the instrument
Reps on target10K PREasy week
A clean, branded card from any earned moment — a PR, a target nailed across every rep, a disciplined week. Yours to post.
6:34Wi-Fi · 84%
sextant
See past the averages.
By continuing you agree to our Terms & Privacy. Sextant reads your running & walking workouts from Apple Health — route, heart rate, pace, cadence, elevation — and nothing else.
6:34Wi-Fi · 84%
‹sextant
How old is the athlete?
Health data is sensitive, so we check age before reading anything. A younger athlete trains on a guardian-managed account.
Nothing is imported until consent is recorded — by you, or by a guardian on a younger athlete's behalf.
6:34Wi-Fi · 84%
‹sextant
Your data is yours.
Health data is special. Here's the promise before you hand any over.
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We read only your running & walking workouts from Apple Health — route, heart rate, pace, cadence, elevation — never your wider health record.
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Your data is never sold. Ever.
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Sextant never trains AI on your data — any read it runs goes through a commercial API under no-training terms, with only short, security-limited retention (not zero-retention). Your runs stay in your account — export or delete them anytime. Point your own AI at them and that copy lives under your AI's terms.
6:34Wi-Fi · 84%
‹sextant
What should we import?
Pick the activities and how far back. You can change this any time.
Activities
Running
your core data — indoor & outdoor
Walking
shares a PR space with running — keep on for accurate bests
How far back
All time RECOMMENDEDtruer PRs
Last 2 years
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Last 90 days
The more history you bring, the truer your all-time PRs and trends. We only read it once.
Next, Apple Health will ask you to allow each data type. You're always in control.
6:34Wi-Fi · 84%
‹sextant
Connect Apple Health
Sextant pulls your runs straight from HealthKit — no giant export to wrangle.
Importing your runsscanning…
Best efforts, weather, and your first reads are computing as they land.
6:34Wi-Fi · 84%
‹sextant
Units
Distancekmmi
Pace/km/mi
Temperature°C°F
Data & plan
Edit imported activities›
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Export gives you everything we hold in an open format. Delete erases your account and data for good.
6:34Wi-Fi · 84%
‹sextant
Guardian setup
For an athlete under 16, a parent or guardian sets up the account and consents on their behalf.
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You consent to data collection for your athlete.
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You can view and manage their training and data from your own account.
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You control all sharing — including with a coach.
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Either of you can export or delete the data, any time.
Verifiable guardian consent is required before any data is collected, per Apple's age rules and GDPR-K. We'll guide you through it next.
6:34Wi-Fi · 84%
‹sextant
Your training plan
Upload a plan or build one. Your assistant reads it as context — like a real coach would.
Upload a plan
PDF · image · TrainingPeaks
Build with assistant
draft it in chat
Current plandrafted with your assistant
Half-marathon · 6-week build
drafted with your assistant · week 1 of 6
wk112 mi long · 2×2 mi tempo · 3 easy
wk213 mi long · 5×1 km interval · 3 easy
wk315 mi long · 3×1 mi tempo · 3 easy
wk414 mi long · 6×800 interval · 3 easy
wk516 mi long · tempo · sharpen
wk6taper · race week
Your assistant reads this plan with every run — so "planned vs actual" is part of the read.
6:34Wi-Fi · 84%
‹sextant
Plans
Free is genuinely useful. The paid tiers go deeper — and your data always comes with you.
Pricing preview · prices set at launch
Free$0
Every run, read straight
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Ask your own AI about a single run.
Data—
Your whole history, yours to use
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Everything in Free, plus your full history — deep intervals & splits, season & year-over-year.
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Take it anywhere — full export, MCP & skill for the AI you already use.
AI—
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Everything in Data, plus the coach-voice read that remembers what you said.