The first six weeks back in the gym at sixty-five

Do half of what you think you can for the first three weeks. That's the whole trick. Not half of what you did at forty, half of what you believe you can handle today. The man who tears something in week one isn't unfit or unlucky. He's just enthusiastic, and enthusiasm outruns tendons.

Your heart and lungs come back fast. Within two or three weeks of walking, you'll notice hills getting easier. Muscle follows over a couple of months. Tendons, ligaments and the connective tissue around your joints take far longer, and they give you almost no warning before they complain. That gap between how good you feel and what your joints are actually ready for is where the injury lives.

So the plan below is built around closing that gap slowly on purpose.

Get the medical side sorted first

If you've got a heart condition, high blood pressure, diabetes, a replaced joint, or you're on medication that affects your heart rate or blood pressure, talk to your doctor before you start. Not as a formality. Ask specific questions: is there an intensity I shouldn't go past, should I expect dizziness when I stand up quickly, is there anything about my medication I should know before I exert myself.

Same goes if you've had chest pain, unexplained breathlessness or fainting. Those get answered before you buy trainers.

If you've had a fall in the last year, mention it. Falls are the single biggest thing that ends independence in your seventies and eighties, and a fall usually has a cause worth finding.

Weeks one and two: walking and five movements

Walk twenty minutes, five days a week. Flat ground. Conversational pace, meaning you could talk but not sing. If twenty minutes is too much, do ten in the morning and ten in the evening. Add five minutes a week, not more.

Then twice a week, on non-consecutive days, do this:

• Sit-to-stand. Stand up from a dining chair without using your hands, sit back down under control. 2 sets of 8.
• Counter push-up. Hands on the kitchen counter, body straight, lower your chest to the edge and press back. 2 sets of 8.
• Hip hinge with a broom. Broom handle along your spine, push your hips back, slight bend in the knees, feel it in the hamstrings. 2 sets of 10.
• Row with a band. Band around a door handle or post, pull to your ribs, squeeze the shoulder blades. 2 sets of 10.
• Suitcase carry. One weight in one hand, stand tall, walk thirty seconds. Switch sides. 2 rounds each side.

That's it. Fifteen minutes. You'll finish feeling like you barely trained, and that's exactly the point. Every rep should end with you knowing you had three or four more in the tank.

Weeks three and four: add load, not exercises

Resist the urge to add new movements. Add weight to the ones you've got.

Sit-to-stand becomes a goblet squat with a dumbbell or a kettlebell held at your chest. Counter push-ups move to a lower surface, a step or a bench. The hinge becomes a dumbbell Romanian deadlift with a light weight. Carries get heavier.

Go up in the smallest increment available. Two and a half kilos on a dumbbell, one plate on a machine. If your gym only has ten-pound jumps, do an extra set at the old weight first for a week.

Keep it at 2 sets. Keep stopping short. Three good sessions in a row at a weight earns you the right to go up.

By week four you should be walking thirty-five to forty minutes and starting to feel genuinely capable. That feeling is when men hurt themselves.

Weeks five and six: three sets, and the floor

Now go to 3 sets on the main lifts, and add two things.

Getting up off the floor. Lie on your back on a rug. Roll to your side, push up to seated, get to a half-kneel, stand. Then reverse it. Five times. It feels undignified for about a week. It's also the most practically useful thing on this list, because the difference between a fall and a hospital stay is often whether you can get back up on your own.

Single-leg balance. Hand near a counter, stand on one leg for thirty seconds. Then try it with your eyes closed, hand hovering. Thirty seconds a side, a few times a week. Balance responds quickly to practice and declines quickly without it.

Soreness is fine. Sharp is not.

Learn the difference and you'll avoid most of the trouble.

Muscle soreness is dull, spread across a broad area, shows up a day later, and eases once you're warm and moving. It's normal, especially in the first fortnight.

Sharp, stabbing or pinpoint pain, pain inside a joint, pain that wakes you at night, or anything accompanied by swelling means stop and get it looked at. Don't train through it and don't wait a month to see whether it settles.

The useful rule: if you're still properly sore 48 hours after a session, you did too much. Take the next session down by a third. That's not a setback, it's information.

What actually goes wrong

The old number. You used to bench a hundred kilos, so you start at seventy because seventy sounds modest. Your muscles might cope. Your shoulder won't.

The class pace. Group classes are good for consistency and terrible for the first month back, because you'll match the pace of the fittest person in the room. Go, but sit out the bits that feel fast and don't apologize for it.

Running too early. Running is high-impact and unforgiving of weak feet and stiff ankles. Walk for three months first. If you still want to run after that, run in short intervals, one minute on, two minutes walking.

Doing it all on Saturday. Motivation arrives on the weekend, so the whole week's training gets crammed into one heroic session. Two short sessions beat one long one every time, at any age, and by a wider margin at sixty-five.

Skipping the warm-up. Five minutes of walking and some arm circles. Cold tissue is the brittle kind.

The unglamorous supporting cast

Sleep is where the adaptation happens. Training hard on poor sleep just accumulates fatigue.

Eat protein at every meal rather than loading it all into dinner. Older bodies are less efficient at using it, so spreading it out helps. If you've got kidney issues or you're managing a specific condition, take that one to a dietitian or your doctor rather than a website.

Drink water before you train, not just during. Thirst gets less reliable as a signal with age.

And write it down. A cheap notebook with the date, the weight and the reps. You'll forget otherwise, and the notebook is what stops you from either stalling for months or jumping twenty kilos because you felt good.

Six weeks from now

You'll be walking forty minutes without thinking about it, squatting with a weight at your chest, and getting off the floor without furniture. None of that will look impressive to anyone watching.

But in ten years, when a man your age is being helped out of a chair, you'll still be carrying your own bags up the stairs. That's what you're training for. Not the mirror.