7 things fit cyclists over 40 believe about their heart that are wrong
Read this before your next hard week.
From the THRIVE teamUpdated November 20268 min read★★★★★ 4.7 from 2,500+ reviews
Seven things, one gap.
1You’re fit, so you assume your heart is fine.
2What you want is decades more hard riding.
3The risk is hard days with no recovery planned between them.
4Here are the seven.
Do you want to keep riding hard into your seventies? Then the question isn’t how fit you are. It’s how much of your riding is hard, how little recovery sits between it, and whether anything tracks what that does to you, year after year. Most fit cyclists over 40 have never planned any of it. Here are the seven things they believe instead.
01
Thinking fit means your heart is safe
You ride more than anyone you know and your doctor says you’re in great shape. One cyclist on r/Garmin thought the same, until an ablation:
“Turns out I was in constant AFib and could’ve dropped dead at anytime over 2 years and had no idea. Thought I was doing great with my heart health.”
u/Burnt_Phoenix22 · r/Garmin
Why it goes unseenA low resting heart rate on the day you check it says nothing about the trend. Without a nightly baseline, there’s nothing to compare against.
Hard days this week5 ▲Plan target2
02
Thinking it’s the hours
Most cyclists worry they ride too much. Researchers who follow endurance athletes for years point somewhere else. In the MARC-2 study of 289 athletes, “it wasn’t total volume that raised the risk. It was the share of training at very high intensity.” Long climbs, threshold efforts, the group ride that becomes a race.
And the riding itself is good for your heart:
46%lower risk of heart disease
263,450 UK adults: people who cycled to work, against people who didn’t.
Celis-Morales et al. · BMJ · 2017 · observational, a link not proof
80%lower risk of death from any cause
Adults given treadmill fitness tests: the fittest against the least fit.
Mandsager et al. · JAMA Netw Open · 2018 · general population
So the answer isn’t to ride less.
Why it goes unseenYour training app counts hours, not hard days, and nothing adds up the group ride.
Resting HR+7 ▲HRV−22% ▼Skin temp+0.6 °C ▲
03
Riding through illness
A cold, a bad week, four hours’ sleep, and you ride anyway. It’s the habit most of us share: training through illness and pushing when we know we shouldn’t. On r/Velo, one reply to a cyclist with weeks of breathlessness:
“I had a friend get some mild myocarditis from a virus, and his symptoms were very similar.”
u/Henry_Darcy · r/Velo
Why it goes unseenYour plan was written before you got sick. Nothing tells it your temperature went up on Tuesday night.
Power182 WHeart rate164 bpm ▲
04
Ignoring a heart rate that’s higher than the watts
Same power, higher heart rate, for weeks. One r/Velo cyclist put it plainly:
“The ‘HR higher than the watts’ thing has me a little freaked out.”
u/Wonderful_Log_378 · r/Velo
His 15-minute power was down 10%. He booked a cardiologist, which is the right call. If something feels wrong on the bike, see a doctor first.
Why it goes unseenThe watch saw the rides, but not most of the nights in between, so the trend under them never formed.
Last full week off11 weeks ago ▲
05
Thinking rest is something you earn
Asked when he last took a week off the bike, one r/Velo cyclist answered: “Last full week off was after CX season which ended in December.” It was August. Recovery is where the work turns into fitness, and after 20 years of hard riding it’s the part you can’t skip.
Why it goes unseenNothing in your week plans rest, so nothing checks whether you got it.
06
Eating the same every day
Hard days and rest days get the same food, and protein falls short of what your training needs as you get older. Under-fuelled hard days don’t turn into fitness. Cyclists who ate carbohydrate with protein after hard riding had restored 27% more muscle fuel four hours later (Ivy et al., 2002).
Why it goes unseenYour food app, if you have one, has never seen your training plan, and nothing counts what you ate in your recovery.
Resting heart rate+8 bpm in 4 weeks ▲
07
Waiting for your body to tell you
Your bike computer sees the ride, your watch comes off at night, and your plan has never seen your sleep or a meal. So the first sign that something is off is usually your body, and by then it’s been going on for weeks. A trend you can see beats a scare you can’t explain.
Why it goes unseenThe readings that would tell you come from four places, and nothing you own looks at them together.
The four things that decide your recovery
What your heart carries comes from four places, and nothing you own looks at all four together
Put the seven together and they come from four places: the load you put on your heart, the strain you carry, the sleep you get and the food you eat.
1Training loadHow many hard days you stack across the whole week, group ride included. Hard days with real easy days between them build you. Stacked, they dig a hole.Sees it todayYour training app, from ride files. It never sees the other three.
2StrainEverything your body carries, day and night: the ride, the job, the commute, the stress. A hard day at work costs recovery the way a hard ride does.Sees it todayA watch, but only while it’s on you.
3SleepWhere the recovery actually happens. Short or broken nights cancel out hard days.Sees it todayA watch, about one night in three. It comes off to charge, or because it’s bulky in bed.
4NutritionEvery day’s food set to that day’s training. If you’re not eating right, you’re not recovering, and you’re back where you started.Sees it todayA food app, if you log. It has never seen your training or your sleep, so almost nobody counts food in recovery.
Sleep and strain only count if something is on you every night and all day.
A watchoff to charge, or too bulky in bed
A ring worn to bedon every night and all day
Three weeks of nights. A filled square is a night that was tracked.
So the answer isn’t another device for one of the four. It’s all four on one plan: something you wear every night and all day for your sleep and your strain, a plan that sets your training and your food, and an AI coach that watches all four at once.
Meet HELIOS 2.0 + THRIVE
Training load, strain, sleep and food, watched together, with a plan that changes with them
In 2026 there was no product on the market that could see every necessary data point, tie it all together and give you one consolidated feedback loop. So we built one.
HELIOS 2.0 is the world’s thinnest and lightest smart ring: 2.0 mm thin, 2.1 g, 7–10 days a charge and another 3–4 weeks in its travel charger, so it stays on every night and all day. That’s your sleep and your strain, measured. THRIVE sets your training load, with the hard days capped, and sets every day’s food to that day’s training, counted in your recovery. MARCO, the AI coach inside it, watches all four at once, changes the plan when one of them moves, and explains every change. It isn’t a medical device and doesn’t diagnose anything.
1HELIOS 2.0Resting heart rate, HRV, sleep, skin temperature and blood oxygen, every night
2Travel chargerIn the box, 3–4 more weeks of charge
3Training planHard days capped, easy days real
4Food for each daySet to that day’s training
5Recovery and sleepPlanned in, moved when you slip
6Ride modeYour phone is the bike computer
Watch it work
What it does when all four pile up in one week
Here it is on the real app screens, start to finish.
Days 1 to 4All four pile up
Three hard days in four, two long workdays, three short nights, and the hardest day eaten on too little food. You feel fine. On its own, none of the four looks like much.
Day 1
Day 2
Day 3
Day 4
Training load
Hard
Easy
Hard
Hard, planned
Strain
Normal
High
High
Normal
Sleep
7h 20m
6h 05m
5h 40m
6h 10m
Food
On target
On target
Under, on a hard day
On target
An example week. Red is where it starts to cost you.
Recovery 45 · rest required · all four named
Day 5The brief says rest, and names all four
Recovery 45, rest required. MARCO names all four: three hard days in four, strain high on two workdays, sleep under baseline with HRV down four days running, and the hardest day under-fuelled. The week is reworked, training, food and bedtime, ready for you to accept.
THRIVE brief for the example week
Session skipped · next one eased · tempo moved
Same dayThe session moves
Accept it, or ask MARCO about it, and the change is made in front of you: today’s spin is skipped, the next hard session is eased and the tempo work moves a day, so the week still builds without digging a hole.
Real THRIVE screen
Food timed to the session · sleep protected
Same dayThe food and the night move with it
Fuelling is timed to the new session, protein within the hour after it, the last meal three hours before bed for cleaner overnight HRV, and a caffeine cutoff to protect your sleep.
Real THRIVE screen
That’s #07, answered on day five instead of week five. No number left for you to work out. The plan changed, and the reason came with it.
THRIVE vs. what you use now
A watch sees part of your night. A training app sees your rides. Neither plans your food or your recovery. THRIVE is built to do all of it.
HELIOS 2.0
Garmin Fenix 8GPS sports watch
TrainerRoadTraining app
Training load: hard days capped across the week
✓
✓
✓
Strain: tracked day and night
✓
✓
✕
Sleep: tracked every night
✓
✓
✕
Nutrition: set to each day and counted in recovery
✓
✕
✕
All four on one plan, changing together
✓
✕
✕
An AI coach watching all four
✓
✕
✕
✓Yes✓Limited✕No
Why the big brands won’t fix this
They sell devices. A bike computer is sold on the ride, a watch on the wrist, a training app on its workout library. None of them is paid to plan your whole week, so none of them does. THRIVE was built the other way round: the plan first, and one ring to keep it up to date.
★★★★★
“MARCO flagged ‘three days of suppressed HRV and elevated resting HR — recommend two days easy’. I ignored him, did the threshold workout, blew up. Now I listen.”
Camille Dufort · Verified buyer
What you’re protecting
How many more seasons will you ride hard on a heart nobody is watching?
The Saturday ride at 80
What do you want from the next 30 years of riding? It isn’t a number on a screen. It’s still being on the Saturday ride at 80, on the wheel up the climb everyone races. A week in the mountains at 65 without a second thought. Riding with your kids when they’re finally fast enough to drop you, and not letting them.
That’s what the hard days are for. Trained, fed, slept on and watched, they build those years. Left to chance, season after season, they’re what puts them at risk.
Trusted by 55,000+ cyclists
Results that speak for themselves
★★★★★
“MARCO kept me from blowing up at the wrong moment three different times across 28 hours of riding. Fueling reminders alone earned the subscription.”
HHenrik SørensenVerified buyer
★★★★★
“I have sensitive skin and a chest strap was hell on every long ride. This replaces it and the readings are within 1-3bpm of my old strap on intervals.”
DDavid ChenVerified buyer
★★★★★
“The sleep insights and the gentle prompts about caffeine timing have changed my evenings. I sleep 40 minutes more on average.”
MMei TanakaVerified buyer
Why a ring
The world’s thinnest, lightest, slimmest smart ring. Beautiful, and made to be worn 24/7 for every occasion.
The world’s slimmest and lightest smart ring: 2.0 mm thin, 6.5 mm wide and 2.1 g of matt black titanium, so it stays comfortable on the bike, at work and asleep. It fits under cycling gloves.
6.5 mm wide
2.0 mm thick · 2.1 g
Smartwatch✕Too bulky, and off to charge
It comes off because it’s bulky in bed or on the bars, or because it needs charging, so whole nights and days go missing.
Fitness band✕Not for every occasion
Typically pretty ugly, and not something you wear to work or to dinner, so it comes off and the gaps start again.
HELIOS 2.0✓Worn 24/7
Thin and light enough to sleep and ride in, beautiful enough for work and dinner, and 7–10 days a charge, with 3–4 weeks more in the travel charger. It stays on.
★★★★★
“Stupid as it sounds, this is the first wearable I haven’t taken off in 6 weeks. No bulk, sits flat under my work glove, charges in 45 min.”
Free shippingFree sizing kit2-year warrantyPay in 4 with Afterpay or Klarna
HELIOS 2.0 is not a medical device. Individual results vary.
Try it for 30 days. Get results in 90, or your money back.
30DAY MONEY BACK
30-day money-back trial
Wear it for 30 nights. Not for you? Send it back for a full refund.
90DAY RESULTS
90-day results guarantee
Your target is set on your heart, with our team, after your first week of nights: for example, resting heart rate back at or under your own baseline by day 90. Miss it and we refund you in full.
Plus a 2-year warranty, free shipping and a free sizing kit before you commit.
Frequently asked questions
Do I need this if my heart feels fine?
Feeling fine is exactly when most cyclists stop paying attention. THRIVE plans your hard days, food and recovery so the load stays where it should, and HELIOS 2.0 tracks your trend every night. If you have symptoms, see a doctor first.
Is HELIOS 2.0 a medical device?
No. It doesn’t diagnose anything. It tracks your resting heart rate, HRV, sleep, blood oxygen and skin temperature every night, and THRIVE uses that to plan your training, food and recovery.
Is it worth it?
Count what you run now: a bike computer, a watch, a training app, a food app, maybe a coach. Each one covers one part. HELIOS 2.0 and THRIVE cover all four in one system.
Will it stop me riding hard?
No. It caps the hard days and makes the easy days real, so the hard days you do ride land properly.
What if it doesn’t fit, or I don’t like it?
A free sizing kit ships first so the size is right. Then you have 30 days from delivery for a full refund.
So you’ve got two options
OPTION A
Keep riding hard and hoping your fitness is protecting your heart.
OPTION B
Put your training, food and recovery on one plan, tracked every night, with 30 days to send it back.
Recovery 45 · rest required · all four named
Session skipped · next one eased · tempo moved
Food timed to the session · sleep protected
