Ageing changes the body in quiet ways. Muscles shrink. Bones thin. Strength drops before most people notice it. By the time clothes feel loose around the arms or knees start hurting, muscle loss may already be significant.After 40, the body naturally begins to lose muscle mass at a faster rate. This process, known as sarcopenia, affects daily energy, balance and long-term independence. It also weakens bones. The two systems work together. When muscles weaken, bones follow.Dr Pradeep Kocheeppan, Consultant Orthopaedics at Apollo Hospitals, Bengaluru, explains the science clearly. “Sarcopenia is defined as age-related, involuntary loss of skeletal muscle mass and strength. It primarily affects type 2 fast twitch muscle fibres, while type 1 fibres are least affected.”Type 2 fibres help with quick, powerful movements. They protect against falls. Losing them means slower reactions and reduced strength. The good news? Muscle responds to training at any age.
Why muscle loss speeds up after 40
Muscle mass begins to decline around the fourth decade of life. Research shows adults can lose 3-8% of muscle mass per decade after 30, and the rate accelerates after 60. A government-backed overview by the National Institute on Aging (US) explains that resistance exercise remains the most effective tool to counter this decline.In India, sedentary work has worsened the problem. Desk jobs, digital devices and reduced physical labour create what doctors call disuse atrophy. Muscles shrink because they are not challenged.Dr Kocheeppan notes, “Indians, especially South Indians, tend to have lower baseline muscle mass genetically. Combined with comfortable life and sedentary jobs, muscle loss becomes almost universal, with upper limbs being most affected.”That means the loss is not only age-driven but also lifestyle-driven.
Strength training is not bodybuilding
Many people avoid gyms after 40 because they associate strength training with heavy bodybuilders. That fear costs them health.“Strength training focuses on increasing the maximum force a muscle can generate. Heavy weights with low repetitions are often used,” says Dr Kocheeppan.But this does not mean extreme lifting. It means controlled resistance, tailored to the individual.He explains how training differs:
- Strength training works at 80% or more of one-repetition maximum (1RM), using compound movements like squats and deadlifts.
- Power training uses 30-50% of 1RM at higher speeds, such as medicine ball throws.
- Endurance training uses lighter resistance for longer duration.
- Hypertrophy training increases muscle size with repeated fatigue cycles.
- Functional training mimics daily movements and improves balance.
“For avoiding muscle loss of ageing, strength training is the only way,” he says.That statement is strong but grounded in evidence. The US Centers for Disease Control and Prevention recommends muscle-strengthening activities at least twice a week for adults.
Muscle is the key to bone health
Bones do not strengthen in isolation. They respond to stress placed by muscles.“Muscle is the key to bones. Bones can’t improve without muscle being trained,” says Dr Kocheeppan.When muscles pull on bone during resistance exercise, they stimulate bone-forming cells. Over time, this can improve bone density or slow its loss.The National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS), part of the US National Institutes of Health, confirms that weight-bearing and resistance exercises help maintain bone strength.This is critical in India, where osteoporosis remains undiagnosed until a fracture occurs.
Know your 1RM before you start
Strength training after 40 must be systematic, not random.“It is very important to evaluate 1 RM (rep max),” says Dr Kocheeppan. One-repetition maximum refers to the maximum weight a person can lift once with proper form.Testing this under supervision helps trainers design safe and effective programs. For example:
- Strength work: ≥80% of 1RM, few repetitions.
- Power work: 30-50% of 1RM at speed.
This structure prevents overtraining and injury. It also ensures muscles are challenged enough to preserve fast-twitch fibres.Poorly planned workouts, on the other hand, waste time and increase joint strain.
5What if the DEXA scan shows weak bones?
A DEXA scan measures bone mineral density. If results show osteopenia or osteoporosis, exercise alone may not be enough.“Bones lost are medically known as lost forever, but with modern therapy we have exercises and medicines to prevent and also to improve,” says Dr Kocheeppan.He highlights several approaches:
- Optimising vitamin D and B12 levels.
- Checking parathyroid hormone (PTH) levels.
- Using medications such as ibandronic acid or denosumab to maintain bone mass.
- Newer drugs like romosozumab (trade name EVENITY) that improve bone density when prescribed appropriately.
He also mentions that in select late cases, anabolic agents may be used under strict medical supervision to stimulate muscle response.These are prescription treatments and must never be self-administered.
Why gyms need better senior training
A hidden issue remains: most gyms cater to young adults.“Today gymnasiums don’t get senior guys. There are not enough qualified trainers to safely train seniors,” says Dr Kocheeppan.That gap discourages older adults from starting strength work. Yet this is the age group that needs it most.Supervised, progressive training reduces fall risk, improves mobility and enhances independence. Strength is not about appearance. It is about quality of life.
The bigger picture: strength equals dignity
After 40, strength training is less about aesthetics and more about autonomy. Carrying groceries. Climbing stairs. Getting up from the floor. These are markers of healthy ageing.The body adapts at any age. Muscle fibres respond to resistance. Bones respond to load. The process requires patience but rewards consistency.Good muscle and bone health protect not just the body, but confidence.Medical experts consulted This article includes expert inputs shared with TOI Health by: Dr Pradeep Kocheeppan, Consultant Orthopaedics at Apollo Hospitals, Bengaluru.Inputs were used to explain why strength training is essential after 40.
