Bone is lazy in a specific way: it does not build itself in anticipation of exercise, it rebuilds in response to load it has already met. That single fact explains why walking the same flat route for years stops changing anything, and why a sudden ambitious weekend can produce an injury instead of an adaptation. After 45, the practical question is not whether to do weight-bearing exercise but how to add load in steps that the body can absorb. A ladder is a better mental model than a workout plan, because it tells you what the next rung is.
What Counts as Weight-Bearing
Weight-bearing means your feet or hands are carrying load against gravity. Walking counts. Standing counts, barely. Swimming and cycling do not, which is why strong swimmers can still have fragile bones. The useful distinction is between loading that is steady, like standing and walking, and loading that is dynamic, like stair climbing, carrying, and controlled impact, which asks more of the skeleton in a shorter time.
Most people over 45 already stand on the first rung without thinking about it. The mistake is assuming that because walking is familiar it is sufficient forever. It is a foundation, not a finish line, and the adaptation it produces plateaus within weeks.
Joint comfort matters as much as bone load. If a knee or hip is unhappy, the answer is usually a different form of loading rather than no loading, and that is a conversation worth having with a physiotherapist rather than guessing.
The Four Rungs
Each rung adds one variable: time, then incline, then load, then impact. Stay on a rung for three to four weeks before adding the next, and drop back a rung for a week if something flares. Progression is supposed to feel slightly boring.
- Rung one: daily walking. Twenty to thirty minutes most days, at a pace where talking is possible but singing is not.
- Rung two: stairs and hills. Two or three short bouts of incline per week, using a handrail when needed and walking down slowly.
- Rung three: carrying. Loaded carries with shopping bags, a backpack, or dumbbells, starting with a weight you could hold for a minute.
- Rung four: controlled impact. Small hops, step drops, or skipping, in short sets on a forgiving surface, only once the lower rungs feel easy.
Rung four is the one people skip and the one that most directly asks the skeleton to respond. It is also the one to approach with the most caution, particularly if you have not jumped in years, are carrying extra weight, or have a history of fracture. A few sets of ten small hops twice a week is a reasonable starting dose, not a plyometric programme.
Recovery, Protein, and the Rest of the Picture
Bone and muscle adapt between sessions, not during them. Two or three loading sessions a week with rest days between is more productive than daily effort at the same intensity, and it leaves room for the walking that keeps everything else working. Sleep belongs in this category too, because the hormonal environment for repair is built at night.
Protein intake deserves a mention because it is the raw material for the muscle that pulls on bone. Many adults over 45 eat most of their protein at dinner, which is the least useful distribution. Spreading it across meals is a small change with a large effect on how well training is used. Fiber and overall diet quality matter for other reasons, and the label reading habits that make those numbers visible apply here as well.
For women in perimenopause, the years around the transition are when both bone loss and muscle loss accelerate, and the perimenopause collection groups the relevant context in one place. Strength work and impact work are not separate programmes at this stage; they are the same programme approached from two directions, and the decade notes explain why the emphasis shifts.
Finally, get the boring checks done. A vitamin D level, a bone density scan if your clinician recommends one, and a review of medications that affect bone are all more useful than another supplement purchased on hope. The by decade collection is organised around that logic: what to look at, and when.
Frequently Asked Questions
Is walking enough to protect bone after 45?
Walking is a good foundation but it plateaus. Adding stairs, carrying, and some controlled impact is what continues to ask the skeleton to adapt.
How fast should I progress?
One new variable every three to four weeks. If you cannot hold a conversation at the end of a session, or need two days to recover from one, you moved too quickly.
What if I already have low bone density?
Impact and heavy loading need individual advice, and some movements should be modified or avoided. Ask a clinician or physiotherapist before starting rung four.
The ladder is not a programme to finish. It is a way of deciding what today's session should be, based on what the last month looked like. Walk daily, add incline when walking is easy, add load when incline is easy, add a little impact when load is easy, and step back down whenever your body asks. For more on how these priorities change across the decades, the stages blog follows the same thread.