From roughly the fourth decade, adults lose muscle mass steadily unless something is asked of it. The clinical name is sarcopenia, and its consequences are practical rather than cosmetic: stairs get harder, balance gets worse, recovery from illness takes longer, and the risk of a fall that changes everything goes up. The encouraging part is that muscle responds to demand at any age — studies in people in their eighties show real gains.
Strength work is the specific stimulus
Walking is excellent and does not replace this. Muscle is maintained by resistance: bodyweight, bands, dumbbells or machines, it matters much less than most people think. Two sessions a week covering the major movements — a squat or sit-to-stand, a push, a pull, and something for the hips — is the shape most guidance converges on.
It is far less time than people assume
Two half-hour sessions a week is a meaningful dose. The common failure is not doing too little per session; it is stopping altogether after a few weeks. Consistency beats intensity by a wide margin here, and starting lighter than feels necessary is the reliable way to still be doing it in six months.
Protein across the day, not in one meal
Older adults use dietary protein less efficiently, so both the total and the distribution matter. Spreading intake across meals — rather than a light breakfast and everything at dinner — supports muscle better. Ordinary food does this; no powder is required.
Balance is trainable, and worth training
Standing on one leg while the kettle boils sounds trivial and is not. Balance declines quietly and responds quickly to practice, and it is the difference between a stumble and a fall.
Recovery is part of the work
Adaptation happens between sessions, not during them. Sleep, a rest day between hard efforts, and not adding weight every single week are what keep progress going once the first easy gains are done.
Before you start
If you have heart disease, uncontrolled blood pressure, a recent injury or joint replacement, or you have been inactive for a long stretch, talk to your doctor or a physiotherapist about where to begin. That conversation is short, and it is the difference between building something and getting hurt in week two.