A client told me recently that he didn’t feel the need to come to the gym anymore. He was getting better at his exercises at home, and the look that tends to come with a lot of gym training, bulky and strong, wasn’t something he was after.
That’s a completely reasonable thing to feel, and it’s also exactly how most of us are taught to think about the gym. Picture a gym ad, a fitness account or a New Year’s promotion, and what you see is a body. Shredded, toned, bulked, whatever the pitch is. After years of that, it’s no surprise that when most people think about the gym, they think about how it will make them look.
It’s understandable. It’s also a very small slice of what training does. So let me ask the bigger question: what is the gym, and training as a whole, actually for?
Why do we think of the gym as an aesthetics project?
Because that’s the story we’ve been sold. Marketing leads with what’s easiest to show: before-and-after photos, physiques, a summer body. Looks are visible, immediate and easy to put on a poster. Capacity, resilience and the quality of your life at 75 don’t photograph well, so they rarely make the ad.
None of that makes wanting to look a certain way a bad goal. Wanting to build muscle, change your shape or feel good in the mirror is a perfectly good reason to train. It gets people in the door and keeps plenty of people consistent, and there’s nothing to apologize for.
The point is that aesthetics is the part of training that’s easiest to see, not the whole of it. You can train for the mirror and also collect everything else that comes with it. The two aren’t in competition. What we’re doing here is widening the lens so the bigger picture is visible too.
What else does training give you?
Capacity. The gym is where you build the physical room to say yes to your life: carrying the groceries in one trip, getting down on the floor with your grandkids and back up, taking the hike your friends picked, recovering from a stumble instead of being sidelined by it.
We call those possibilities affordances, the things your body makes available to you. More capacity, more affordances. Less capacity, a menu that quietly gets shorter.
Why does “good enough” capacity stop being good enough?
Because capacity isn’t fixed. Starting at some point in adulthood, it slowly drifts down.
A consensus statement from an international group of aging researchers says aging and a sedentary lifestyle are associated with declines in muscle function and cardiorespiratory fitness, which impairs the ability to perform daily activities and stay independent. The same authors note that with adequate exercise, these declines are substantially attenuated (Izquierdo et al., 2021).
Picture two people at 50. Both feel fine and do everything they want. One has a lot of room between what life demands and what their body can deliver. The other is living near the edge.
That edge shows up in real bodies. In a small study of women walking at their normal pace, older women were already using about 90% of their maximal hip, knee and ankle strength, compared with about 65% in younger women. The authors concluded that older women have limited functional reserve to speed up or handle anything harder (Spinoso et al., 2019). One small study, so treat the numbers as an illustration rather than a rule. But it shows what “riding the line” looks like.
And if your capacity barely covers your life, a small decline doesn’t feel small. It’s stairs that feel hard, or a trip you skip. A study comparing 75- and 80-year-olds born 28 years apart found that the relationship between leg strength and walking speed leveled off at higher strength levels. People with lower strength were still on the steep part of the curve, where each loss cost them walking speed (Koivunen et al., 2023). Above a certain level of capacity, small losses cost you little. Below it, they cost you a lot.
That’s what a buffer is. And the gym is where you build one, years before you need it.
Does endurance matter too?
Yes. Aerobic capacity declines with age, and training changes how fast. In masters endurance athletes, VO2max declined between 5% and 46% per decade, with changes in training volume explaining about 54% of the variance in men and 39% in women, and a drop of up to 20% within 12 weeks of stopping (Burtscher et al., 2022). Those are athletes, so your numbers will differ, but the decline isn’t one fixed slope.
How much does it take?
Less than most people think. A meta-analysis of 16 prospective cohort studies found that muscle-strengthening activity was associated with a 10–17% lower risk of all-cause mortality, cardiovascular disease, cancer and diabetes, with the biggest benefit around 30–60 minutes a week. Combining strength with aerobic work was associated with lower mortality than either alone (Momma et al., 2022). Another meta-analysis of 49 studies found that muscle wasting was associated with about a 36% higher risk of all-cause mortality (Zhou et al., 2023). Both are observational, so they show association, not cause.
That’s not a bodybuilding split. That’s a savings plan.
Can you build that buffer at home?
Often, yes. A network meta-analysis of 102 trials in about 4,750 older adults found that every type of resistance training improved strength, including bodyweight and bands. Machines had the largest average effect, free weights came next, and bodyweight had the smallest. The authors’ takeaway was to choose what you’ll enjoy and stick with, as long as load, volume and duration are adequate (Wiedenmann et al., 2025).
So home training counts. The question is whether it’s still challenging and varied enough to keep growing your buffer. A gym adds heavier loads, more ways to progress, a coach who spots a plateau, and other people. In the LIFTMOR trial, postmenopausal women with low bone mass who did supervised heavy lifting twice a week for 8 months improved lumbar spine bone density and outperformed a low-intensity home group on every functional test, with only one minor adverse event (Watson et al., 2018). The difference was loading intensity, not location, but heavy loading is easier to do safely with equipment and a plan.
And there’s the part no study can fully capture: training around other people. In my own experience, strength work, conditioning and a room full of people showing up for each other is one of the most sustainable ways to keep at it for decades.
What This Means for You
Train for whatever motivates you. If it’s how you look, that’s valid. If it’s how you move, that counts too. Most of the time it’s both.
Know you’re getting more than you paid for. Even if the mirror is your reason, the same work builds a buffer against the slow drift of aging.
Train strength and endurance. They decline separately, and the combination is associated with the best outcomes.
Start small. Around 30–60 minutes of strength work a week is where the research sees the biggest return. Two sessions beats a perfect plan you drop in March.
Keep it hard enough to matter. At home or in the gym, make sure something is progressing: load, reps, range or control.
The Ascension take
We don’t tell anyone what they should want from their body. Most of what the fitness world talks about is how training looks. We’d rather talk about what it does. We help you figure out where you want to be, whether that’s looking a certain way, moving a certain way, or both, and then build the capacity to get there and keep it. The mirror is a fine reason to start. The buffer is what you get to keep.
If you’re not sure what your own goals look like, that’s a good conversation to have with us.
Sources
Retrieved via PubMed.
Izquierdo M, Merchant RA, Morley JE, et al. International exercise recommendations in older adults (ICFSR): expert consensus guidelines. J Nutr Health Aging. 2021;25(7):824-853. doi:10.1007/s12603-021-1665-8
Spinoso DH, Marques NR, LaRoche DP, et al. Hip, knee, and ankle functional demand during habitual and fast-pace walking in younger and older women. J Aging Phys Act. 2019;27(2):242-251. doi:10.1123/japa.2017-0351
Koivunen K, Portegijs E, Karavirta L, Rantanen T. Comparing the associations between muscle strength, walking speed, and mortality in community-dwelling older adults of two birth cohorts born 28 years apart. Geroscience. 2023;46(2):1575-1588. doi:10.1007/s11357-023-00925-z
Burtscher J, Strasser B, Burtscher M, Millet GP. The impact of training on the loss of cardiorespiratory fitness in aging masters endurance athletes. Int J Environ Res Public Health. 2022;19(17):11050. doi:10.3390/ijerph191711050
Momma H, Kawakami R, Honda T, Sawada SS. Muscle-strengthening activities are associated with lower risk and mortality in major non-communicable diseases: a systematic review and meta-analysis of cohort studies. Br J Sports Med. 2022;56(13):755-763. doi:10.1136/bjsports-2021-105061
Zhou HH, Liao Y, Peng Z, Liu F, Wang Q, Yang W. Association of muscle wasting with mortality risk among adults: a systematic review and meta-analysis of prospective studies. J Cachexia Sarcopenia Muscle. 2023;14(4):1596-1612. doi:10.1002/jcsm.13263
Wiedenmann T, Held S, Morat T, et al. The effects of different resistance training modalities on muscle strength in community-dwelling older adults: a network meta-analysis. Gerontology. 2025;71(7):576-588. doi:10.1159/000546346
Watson SL, Weeks BK, Weis LJ, Harding AT, Horan SA, Beck BR. High-intensity resistance and impact training improves bone mineral density and physical function in postmenopausal women with osteopenia and osteoporosis: the LIFTMOR randomized controlled trial. J Bone Miner Res. 2018;33(2):211-220. doi:10.1002/jbmr.3284
