Exercise

Take a seat.

Most people are aware that exercise matters. Fewer people do enough of it, and fewer still understand why it matters in ways that go considerably beyond weight management or cardiovascular fitness. In later life, the stakes are higher than is generally appreciated — and so is the potential.

One point before anything else. For anyone who is not accustomed to regular exercise, professional advice before beginning is not a suggestion — it is a real necessity.

Existing conditions, whether cardiac, related to balance, joint health, or others, can make certain forms of exercise inappropriate or requiring of careful modification. A conversation with a doctor or qualified exercise professional at the outset is time well spent and could matter considerably.

With that clearly stated, here is something worth knowing. A recent study found that even people in their nineties can achieve meaningful, lasting benefits from High Intensity Interval Training — HIIT — with as little as twelve weeks of consistent work.

Twenty-four weeks would be better.

Another point worth considering is that moderate intensity exercise is often said to be best. Some advisers say that one result of the common prescription preferring moderate exercise is that it may not be enough to make any difference.

These findings challenge the widespread assumption that serious physical improvement is the exclusive territory of the young. The body’s capacity to respond to appropriate exercise does not simply expire at a certain age. It requires more care, more professional guidance, and more attention to recovery — but it remains.

There is a condition, however, that exercise directly addresses that deserves to be named with the same seriousness we reserve for cancer and cardiac disease. It is called sarcopenia — the progressive loss of muscle mass that begins, for most people, around the age of forty and accelerates through the decades that follow. Sarcopenia is not merely an inconvenience. It is a significant, life-impacting, and potentially life-ending condition that receives a fraction of the public attention it deserves.

What is particularly worth understanding is that not all muscle tissue is lost equally. The body contains different types of muscle fibre, and it is the Type 2 fast-twitch fibres — responsible for speed, power, and rapid response — that are disproportionately affected.

This is why older people typically move more slowly, react less quickly, and are more vulnerable to falls. It is not simply ageing in a general sense. It is a specific, nameable process with specific, addressable causes.

Exercise — the right kind, undertaken consistently and with appropriate guidance — is the most effective intervention available. Not as a cure, but as a meaningful defence.

The connections to diet, sleep, and the broader biology of ageing run directly through this. Exercise does not operate in isolation, and neither does sarcopenia. Both will reappear when we turn to the Hallmarks of Ageing.

Jack Lack’s Listening Chair is always here, as is your welcome.