When knees begin to ache or hips feel stiff, resting them can seem like the safest choice. But avoiding movement for too long may actually make everyday activities harder by allowing muscles, balance, and joint function to decline.
Evidence reviewed in an article published by The Conversation shows why carefully chosen exercise can be one of the most useful tools for protecting mobility as we age. The key is not simply exercising more, but choosing movement that the body can handle safely.
A healthy joint is more than two bones meeting each other. The ends of the bones are covered with smooth cartilage that creates a low-friction surface for movement and helps absorb forces during activities such as walking.
Inside many joints is synovial fluid, which works as a natural lubricant. It also helps provide cartilage with nutrients because cartilage does not have the rich blood supply found in many other tissues.
This makes movement important. As a joint bends and straightens, synovial fluid moves through the joint environment, helping cartilage receive the materials it needs.
Age can change this system. Cartilage may become thinner or damaged, muscles can lose strength, and the body’s ability to control movement can become less precise.
Osteoarthritis develops when changes within a joint lead to problems such as pain, stiffness, and reduced function. More than 500 million people worldwide are affected, making it a major cause of disability.
People sometimes assume that exercise will simply grind down an arthritic joint faster. However, research shows that suitable exercise can reduce pain and improve the ability to move in people with knee osteoarthritis.
A landmark Cochrane review brought together evidence from many studies and found clear benefits from exercise. This does not mean every exercise suits every painful joint, but it challenges the idea that rest is always the safest response.
Muscles are part of the reason exercise helps. Strong muscles around the knees, hips, and other joints can absorb force and control movement, reducing some of the load that reaches sensitive joint structures.
The quadriceps are especially important for the knee. These large muscles at the front of the thigh help control the leg during walking, standing up, climbing stairs, and many other daily movements.
Strength is only one piece of healthy movement. The nervous system also needs to know where the body is in space, an ability called proprioception.
You use proprioception every time you walk without staring at your feet. Sensors in muscles and joints send information to the brain, allowing it to make rapid adjustments to posture and movement.
This ability tends to decline with age. If those signals become less accurate, a person may be less steady and may place force through joints in less controlled ways.
Balance and coordination exercises can challenge this system. Walking on safe but slightly varied ground, for example, forces the body to make small adjustments that a perfectly flat surface does not require.
Research published in 2026 found that unstable-surface training could improve postural control in older adults. Another systematic review found that exercise programs that deliberately challenged balance were associated with about a 23% reduction in falls.
Preventing falls is particularly important for older people. A fall can cause serious injuries and may also make someone afraid to walk or exercise, leading to further losses in fitness and independence.
Low-impact activities can make movement more manageable for people with sensitive joints. Swimming and water aerobics reduce the amount of body weight that joints must support because the water helps hold the body up.
Cycling is another option because it moves the knees repeatedly without the same impact created by activities such as running. The resistance can also be adjusted to match a person’s fitness and comfort.
Tai chi uses slow, controlled movements that challenge balance without requiring high-impact actions. Research has found benefits for people with knee osteoarthritis, and yoga can also support flexibility and muscle control when poses are performed within a comfortable range.
Walking remains one of the easiest forms of exercise to access. Someone who has been inactive can begin with a short walk and gradually increase the time rather than trying to complete a long session immediately.
People interested in balance training can start with simple exercises on firm ground while staying close to a bench, wall, or sturdy counter. More difficult surfaces should be introduced gradually, and unstable-surface exercises should not be attempted when someone is tired or feels unsteady.
Exercise can still cause injury if it is poorly matched to the person. For example, forcing a yoga pose, using poor technique during squats, or suddenly doing much more activity than usual can increase pain rather than reduce it.
A physiotherapist or accredited exercise physiologist can help people with persistent pain or limited mobility choose suitable exercises. Professional advice is especially useful when someone has already fallen, has severe arthritis, or has other health conditions affecting movement.
The evidence discussed in the original article includes a Cochrane review of exercise for knee osteoarthritis, studies of tai chi, a 2026 study examining unstable-surface training, and research reviewing balance exercise and fall prevention. The article appeared in The Conversation.
Taken together, these findings suggest that aging joints usually benefit from appropriate movement rather than complete protection from movement. Exercise cannot restore severely damaged cartilage to a youthful state, but it can improve the systems around the joint that help people move with less pain and greater control.
The research on balance is particularly important because mobility is not only about whether a joint hurts. Being able to react, adjust, and stay upright can determine whether older adults feel confident enough to remain active in daily life.
The best approach is therefore likely to combine several kinds of movement. Strength training can support joints, aerobic activity can maintain fitness, and balance and coordination exercises can help the nervous system control the body more effectively.
Growing older will inevitably change the body, but painful or aging joints do not automatically mean exercise should stop. Starting gently, progressing gradually, and choosing activities that feel safe can help people continue moving and protect their independence for years to come.
Source: The Conversation.
