LONGEVITY
The longevity fitness app: what to look for
A longevity fitness app should track the measures linked with living longer, keep you training for years, and count every sport you do. Complete is the fitness superapp: every sport counts, and you compete with your friends in all of them. The aim is more good years: Complete starts from your long-term goals, reads your recovery and gives you a Complete Age for your body. It cannot promise you a number of years, and neither can any app.
What the research links with living longer
A study of 122,007 patients who took a treadmill test, followed for a median of 8.4 years, found that cardiorespiratory fitness is inversely associated with long-term mortality, “with no observed upper limit of benefit”. Cardiorespiratory fitness is how well your heart, lungs and muscles work together to keep you going. Patients in the low fitness group had about five times the risk of dying over the follow-up as patients in the elite group (an adjusted hazard ratio of 5.04).
Fitness in that study was estimated from performance on the treadmill, and it was a retrospective cohort study, which follows groups of people through past records. It shows an association and cannot show cause.
The World Health Organization (WHO) fact sheet of 26 June 2024 says that any amount of physical activity is better than none, and that muscle strengthening benefits everyone. The US Centers for Disease Control and Prevention (CDC) says adults need at least 150 minutes of moderate-intensity activity a week, or 75 minutes of vigorous-intensity activity, and at least 2 days of muscle-strengthening activity each week.
These are results for groups of people. They do not tell you how many years you will gain, and no app can.
- Mandsager et al., JAMA Network Open, 2018: cardiorespiratory fitness and long-term mortality checked 18 Oct 2026
- WHO fact sheet: physical activity (26 June 2024) checked 18 Oct 2026
- CDC: adult physical activity guidelines checked 18 Oct 2026
What a longevity fitness app should measure
Six measures, in plain words, with where each one shows up in Complete.
| Measure | In plain words | In Complete |
|---|---|---|
| VO2max | The most oxygen your body can use during hard effort, a common way to measure cardiorespiratory fitness | Part of Complete Age. From the Cooper 12-minute test, a Complete ramp test, a lab test you import, or your watch through Apple Health |
| Resting heart rate | How many times your heart beats a minute when you are at rest | Part of Complete Age and of your recovery score |
| HRV | The small variation in time between your heartbeats | Part of Complete Age and of your recovery score |
| Strength and balance | What you can do with your own body: push-ups, pull-ups, a dead hang (hanging from a bar), sit-to-stand and a balance test | Part of Complete Age from the four currently counted tests; sit-to-stand is recorded but not currently counted in Complete Age |
| Consistency | How regularly you train over the weeks | Not currently counted in Complete Age |
| Blood results | A published estimate of biological age, PhenoAge, can be worked out from a blood panel | Adds a PhenoAge to Complete Age if you add a panel that has the measures PhenoAge needs |
How Complete works toward more good years
Complete starts from your goals, not from a plan. The goals screen says: “Not a plan. These are your forever goals. They steer what Complete recommends every day.” A body is built over years, so the app keeps going between races and after any plan ends.
Every workout that reaches Apple Health counts, along with imported FIT files (the workout file most sports watches can export), runs tracked with your phone and sessions you log. Your recovery is scored against your own baseline from HRV, resting heart rate, sleep and breathing rate. On a red day, today turns into rest or an easy session, and your week stays.
Complete Age is an age for your body that currently reflects cardio fitness, resting heart rate and HRV, and functional fitness. Blood results can also contribute if you add them. Training consistency is not counted yet. It is Complete’s own number, not a medical test or a diagnosis.
Complete is free to download, and logging and sharing your workouts on it stay free.
A strength session with a small kit
Strength counts, and it does not need a full gym. This full-body session comes from Complete’s library, where it is listed as a minimal kit circuit. It needs a pair of dumbbells (the gorilla and renegade rows use both), a kettlebell or one of the dumbbells for the swings, and a bar for the pull-ups, which the beginner version scales to a band or an inverted row. A circuit is a set of exercises done one after another, then repeated. Effort is out of 10, where 10 is all you have.
| Block | What you do |
|---|---|
| Warm-up | World’s greatest stretch, 4 per side: open the hips and upper back. Goblet squat, 8 reps, light: grease the squat pattern before loading the circuit. |
| Main: 3 rounds, resting 90 seconds between rounds | Goblet squat, 12 reps at effort 8 out of 10: hold the weight at your chest and sit straight down between the hips. Gorilla row, 12 per side at effort 8: hinge over two weights and row one to the hip while the other stays planted on the floor. Push-up, 12 reps: lower until the chest grazes the floor and keep a straight line from heel to head. Renegade row, 10 per side at effort 8: from a tall plank on two dumbbells, row one to the hip without letting the hips rotate. Pull-up, 8 reps: pull the chest toward the bar. Kettlebell swing, 15 reps at effort 8: snap the hips, and the arms only guide the bell. Walking lunge, 10 per side: step long and drop the back knee toward the floor. Russian twist, 20 reps at effort 8: tall spine, lean back and twist from the ribcage to touch the weight beside each hip. |
If you are new to this session
The library scales it for a beginner: drop the push-ups to your knees, scale the pull-ups to a band or an inverted row, and rest as needed between movements. To progress, add a round or a little load.
Another app built around your body’s state
Gentler Streak’s page says: “Every day it suggests the workout that fits your body’s current state.” It has a Daily Readiness check, a 10-day view for planning ahead and a 30-day Activity Path. It reads and writes Apple Health data in both directions, has an Apple Watch workout tracker, and says all analysis happens on your iPhone.
If you want a gentle, readiness-led app on your wrist, Gentler Streak is built for that. Complete is the pick if you want your goals, your friends and every sport you do in one app.
- Gentler Streak home page checked 18 Oct 2026
Corrections
If a fact about another app or a study here is wrong or out of date, email support@ccomplete.app and we’ll fix it.
Frequently asked questions
Can a fitness app help me live longer?
No app can promise that. Research links higher cardiorespiratory fitness and regular physical activity with lower mortality, and an app can help you keep training for years. Complete’s aim is more good years.
What should a longevity fitness app measure?
Your cardio fitness (VO2max), resting heart rate, HRV, strength and balance, how consistently you train, and your blood results if you add them. Complete Age currently reflects cardio fitness, resting heart rate and HRV, and functional fitness, plus blood results if you add them. It does not yet count consistency.
What is Complete Age?
Complete Age is an age for your body that currently reflects cardio fitness, resting heart rate and HRV, and functional fitness. Blood results can also contribute if you add them. Training consistency is not counted yet. It is Complete’s own number, not a medical test.
Is VO2max important for living longer?
In a study of 122,007 patients, higher cardiorespiratory fitness, estimated from treadmill performance, was linked with lower mortality, with no observed upper limit of benefit. It is an association, not proof of cause.
How much exercise do I need?
The CDC says adults need at least 150 minutes of moderate-intensity activity a week, or 75 minutes of vigorous-intensity activity, and at least 2 days of muscle-strengthening activity. Complete recommends a session each day from your goals and your recovery.
Does Complete give medical advice?
No. Complete Age is not a diagnosis, and nothing in the app or on this page is medical advice. Ask your doctor about your health.
Is Complete free, and is it on Android?
Complete is free to download, and logging and sharing your workouts on it stay free. It is an iPhone app, so it is not on Android.