By Dr. Asnat Raziel, bariatric surgeon specializing in obesity treatment, metabolic health and healthy longevity; Director of the Multidisciplinary Center for Obesity Treatment, Assia Medical, Assuta Ramat HaChayal, Tel Aviv
What is complete fitness for longevity?
Fitness for longevity starts with small moments. You stop halfway up the stairs to “check something on your phone.” You hesitate before lifting your suitcase into the overhead bin on a plane. Getting up from the couch now comes with a little “oof” that wasn’t there a few years ago. On a trip, you skip the long trail because of “the knee.” Each of these moments seems trivial. Together, though, they tell the story of a body that is quietly losing its reserve.
The good news is that you can rebuild this reserve at almost any age. Large studies show that you don’t need to be an athlete to enjoy the benefits of physical activity. Instead, you need to develop strength, endurance and balance, move every day and stay patient and consistent. I call this “complete fitness.”
The question to ask before you buy a gym membership
When we say “I want to get in shape,” most of us think about losing weight, running or going back to the gym. But there is a better question: what would I want my body to let me do twenty years from now? Climb three flights of stairs without stopping? Pick up a grandchild? Carry the groceries from the parking lot? Travel abroad for whole days at a time? Get up off the floor without holding on to anything?
In healthy longevity medicine, these are exactly the goals. The aim is to extend healthspan: the number of years we live in good health and good function. Complete fitness for longevity is a planning framework that links physical abilities to the habits that support them. It is not a single medical protocol proven superior to every other program. Rather, it is a way to make sure you don’t neglect any important component.
Ten thousand steps? You can breathe easy
The foundation of everything is movement throughout the day: walking, housework, gardening, taking the stairs instead of the elevator. A planned workout adds a focused stimulus, but small activities add up too.
And what about the famous 10,000 steps? It is a familiar goal, but not a magic number. A meta-analysis published in The Lancet Public Health pooled data from 15 cohort studies and 47,471 adults. In people aged 60 and older, the risk of death fell as step counts rose, up to about 6,000–8,000 steps a day. In younger adults, the decline continued up to about 8,000–10,000 steps. This is an observational association, not proof that a specific number guarantees a longer life.
The practical message is freeing. If you walk 3,000 steps a day today, gradually adding another thousand, and then another, is a meaningful goal in itself. For example, you can start with a short walk after a meal, get up from your chair every hour or take the longer route home.
Strength: the body’s savings account
Strength has three faces. Maximal strength is the ability to overcome heavy resistance. Muscle power, sometimes called explosive strength, is the ability to produce force quickly. Finally, muscular endurance is the ability to repeat an action and keep going.
In real life, you need all three: to lift a suitcase, to catch yourself when you trip and to carry bags down the street. That is why a good strength program is not a single ab exercise. Instead, it works the legs, back, chest, shoulders and core, and it matches the load to your ability. Even your hand grip strength says quite a lot about how you are aging.
The World Health Organization’s guidelines recommend that adults do muscle-strengthening activity at moderate or greater intensity on at least two days a week, involving all major muscle groups. You can use weights, resistance bands, machines or your own body weight. Just starting out? Chair stands, wall push-ups and band rows are an excellent starting point. Over time, increase the challenge gradually while keeping control of the movement.
If you are losing weight, especially with medication, this deserves double attention. Preserving muscle mass during weight loss is part of the treatment, not an add-on.
Endurance fitness for longevity: breathing room for life
Cardiorespiratory fitness reflects the body’s ability to deliver oxygen to the muscles and use it during exertion. The best-known measure is VO₂max, or maximal oxygen uptake: the maximum amount of oxygen the body can use per minute at peak effort.
A broad review published in the British Journal of Sports Medicine in 2024 brought together meta-analyses based on 199 cohort studies and more than 20.9 million observations. Each 1-MET increase in cardiorespiratory fitness was linked to an 11%–17% lower risk of death from any cause. A MET (metabolic equivalent) measures exercise intensity relative to rest. Keep in mind that this is a statistical association in populations. It does not promise that every personal improvement will lower your risk by the same amount.
To build endurance, you can walk briskly, cycle, swim or dance. According to the WHO, the target for adults is 150–300 minutes a week of moderate-intensity aerobic activity, or 75–150 minutes of vigorous activity. You can accumulate the time in short bouts and build up gradually. Short, intense workouts can add a challenge, but you don’t need them to get started, and they don’t automatically suit everyone. Not sure which matters more for fitness for longevity? I wrote about this at length in my comparison of aerobic vs. strength training.
Balance: the fall that didn’t happen
Most people don’t think about balance until their first fall. Yet balance is a skill you can train, just like a muscle. Flexibility gives you range of motion, motor control lets you use it, and stability keeps your body organized when you bend to tie your shoes, turn around in the kitchen or walk on a broken sidewalk.
A Cochrane review on preventing falls in older adults living in the community found that exercise programs reduced the rate of falls by 23%, based on 59 studies and 12,981 participants. The strongest evidence supported exercises that challenge balance and function, which reduced the rate of falls by 24%.
You can start with weight shifts, controlled walking and rising from a chair. Practice standing on one leg next to a counter or a wall, with support within reach. Over time, these simple drills become a quiet pillar of fitness for longevity.
Train movements, not just muscles
A simple way to organize a workout is to think in movement patterns: squat, hip hinge, lunge, push, pull and carry. These are exactly the actions of daily life: sitting down and standing up, lifting a box, opening a heavy door, carrying a shopping basket.
Running, jumping and changing direction add speed and reaction time for those who are suited to them. However, you don’t have to do every pattern in every session. If you have joint pain, you can choose adapted versions. If you have a functional limitation, you can start with seated exercises. The list is a planning tool, not a test that separates “fit” from “unfit.”
“I’m too old for fitness”? The research says otherwise
Physical capacity is a reserve. Strength, endurance and balance help us cope with the demands of daily life. The more we develop them, the better we can stay independent, even through periods of illness, hospitalization or inactivity.
The LIFE study, published in JAMA, tested exactly this. Researchers randomly assigned 1,635 people aged 70–89 to two groups. The participants were inactive and had functional limitations, but they could walk 400 meters. One group did moderate-intensity walking, strength and flexibility exercises: twice a week at a center and 3–4 times a week at home. Meanwhile, the other group attended health education workshops.
Over an average follow-up of 2.6 years, 30.1% of the activity group lost the ability to walk 400 meters, compared with 35.5% of the education group. That is a difference of 5.4 percentage points, or a relative risk reduction of about 18%. Activity did not prevent every limitation, but it improved the chances of staying mobile. Notably, it did so in people whom many would assume were “already too old.”
Beyond the workout: food, sleep and people
Exercise doesn’t happen in a vacuum. A diet that provides energy, protein and a variety of nutrients supports effort and recovery. So build your meals around vegetables, fruit, legumes, whole grains and suitable protein sources, and cut back on foods that encourage overeating.
A controlled trial at the US National Institutes of Health showed how strongly the food environment matters. Twenty adults stayed at a research center and ate an ultra-processed diet for two weeks and an unprocessed diet for two weeks, with meals matched for calories, sugar, sodium and fiber. On the ultra-processed diet, they ate an average of 508 extra calories a day and gained 0.9 kg. On the unprocessed diet, by contrast, they lost 0.9 kg. It was a small, short trial, but the message is clear: what is on your plate affects how much you eat.
Sleep and people: more pillars of fitness for longevity
Sleep is also part of the plan. A consensus statement from the American Academy of Sleep Medicine and the Sleep Research Society recommends that adults aged 18–60 regularly sleep at least 7 hours a night. Needs vary from person to person, so pay attention to sleep quality and to how alert you feel during the day as well. You can read more in my guide to improving sleep naturally.
And there is one component that almost no training program includes: people. A meta-analysis in PLOS Medicine of 148 studies and 308,849 participants found that stronger social relationships were linked to a 50% higher likelihood of survival over the follow-up period. These findings do not prove that friendship alone extends life. Still, they support the idea that human connection belongs in any plan for fitness for longevity.
What about a walk in the park with a friend? It checks several boxes at once. A study published in Scientific Reports of 19,806 participants found that people who spent at least 120 minutes a week in nature were more likely to report good health and high well-being. This is an observational finding from a one-time survey, not a precise “prescription.” Even so, it is a recommendation that is very easy to follow.
Start fitness for longevity tomorrow morning
Choose a personal functional goal, something that matters to you. Climbing two flights of stairs without getting out of breath. Walking for an hour with your kids. Getting up from a low chair with ease. Next, combine daily movement, two strength sessions a week and balance practice, according to your ability. Start with an amount you can sustain, and increase it gradually.
Block out a fixed time for exercise in your calendar, and prepare a “plan B” for busy days. For instance, if you have no time for a long walk, three 10-minute walks will do the job. Missed a workout? Simply get back to the next one, without trying to “make up for it” with an unusually heavy load. Define success by consistency over months, not by one perfect week.
A trainer or physical therapist can help you adapt exercises to your limitations and learn proper technique. If you have heart disease, pain or another medical limitation, talk to your doctor before you raise the intensity. And when illness, pain or fatigue change what you can do, adjust the plan rather than giving it up.
The bottom line on fitness for longevity
Track your progress not only on the scale but through life itself. Do you get tired less? Do you move with more confidence? Can you do something that was hard six months ago? Complete fitness grows from consistency, adaptation and variety. Every ability you build today is a direct investment in the years when you can keep traveling, working, enjoying life and living independently.
The information in this article is general and is not a substitute for personal medical advice.
References
Daily steps and all-cause mortality: a meta-analysis of 15 international cohorts
WHO Guidelines on Physical Activity and Sedentary Behaviour
Exercise for preventing falls in older people living in the community
Social relationships and mortality risk: a meta-analytic review
Spending at least 120 minutes a week in nature is associated with good health and wellbeing
