10/09/2026
Age is not an excuse to stop exercising. The stronger you stay, the better you age. It doesn’t take much, but you do have to start now. I just posted a link to a deal at the gym where I teach Pilates. You can do exercise at home. You can walk. You can use the two minutes every time your kettle is boiling to do squats, or pushups. There is always time. What you need is to start..
See me in clinic to chat about feeling WELL, so you can start doing more, so you feel GREAT.
Physical fitness does not appear to peak at one universal age. Different physical capacities reach their highest point years apart, and what happens after that peak is strongly influenced by how active we remain.
Researchers followed 427 Swedish adults from age 16 to 63, repeatedly measuring aerobic capacity, upper-body muscular endurance, and leg power over 47 years. Relative aerobic capacity peaked at about age 26 in men and 31 in women. Bench-press endurance peaked later, around 36 in men and 34 in women. Leg power peaked earliest, at an estimated age 27 in men and 19 in women.
The more important finding may be what happened afterward. Decline was initially slow, but accelerated with age. By 63, participants had lost roughly 30% to 48% of their peak capacity depending on the measure. Relative aerobic capacity was about 37% lower in women and 40% lower in men, while vertical-jump performance had fallen 48% and 41%, respectively.
Physical activity did not appear to prevent the biological timing of peak performance, but it was associated with substantially better performance across adulthood. People who went from inactive to active had approximately 6% to 7% higher aerobic capacity, 11% better bench-press endurance, and 4% better vertical-jump performance in the study models.
That distinction matters. Aging eventually reduces physical capacity even in highly trained athletes, but the trajectory is not fixed. At age 63, participants in this general population cohort retained about 65% of peak aerobic capacity and muscular endurance, while prior data cited by the authors suggest master endurance athletes of the same age can retain more than 80%. That comparison comes from separate athlete studies, so it should not be interpreted as proof that training alone explains the entire gap.
Peak performance may come earlier than most people realize, but the rate of decline remains meaningfully associated with physical activity.
Westerståhl M, et al. Rise and Fall of Physical Capacity in a General Population: A 47-Year Longitudinal Study. J Cachexia Sarcopenia Muscle. 2025;16:e70134. PMID: 41243424. DOI: 10.1002/jcsm.70134.