Training
The runners who struggle after 40 are almost always the ones who kept training exactly as they did in their 30s. The runners who continue to improve are the ones who understood what changed and adapted accordingly. Here is what you need to know.
What Actually Changes
The physiological changes that accompany ageing are real, measurable, and begin earlier than most runners expect. VO2 max, the body's maximum capacity to utilise oxygen, declines at roughly 1 percent per year from the mid-20s, with that rate accelerating somewhat after 50. Muscle mass decreases through a process called sarcopenia. Connective tissue becomes less elastic, increasing injury risk. Testosterone and oestrogen levels decline, both of which affect muscle protein synthesis and recovery speed.
None of this means performance is inevitably worse. Many of these declines are substantially mitigated by consistent training, and the running-specific adaptations of training, improved aerobic capacity, better running economy, higher lactate threshold, remain entirely accessible to masters athletes. The research on this is consistent: the response to structured training in runners over 40 is comparable to that of younger runners, even if the absolute ceiling is slightly lower.
What does change significantly is recovery. Masters runners typically take 30 to 50 percent longer to recover from hard training sessions and races than runners in their 20s and early 30s. This single fact has more practical implications for training structure than any other physiological change.
"The mistake most masters runners make is not training too little. It is not recovering enough between the training they are already doing."
The Critical Factor
A training plan that worked brilliantly at 35, with a hard session on Tuesday, a tempo on Thursday, and a long run on Sunday, will often break down a masters runner because the recovery windows are too short. The same training stimulus, with 48 to 72 hours of easy running or rest between hard sessions rather than 24 to 36, typically produces better results and a much lower injury rate.
This does not mean doing less hard training. It means being more deliberate about spacing it out, and ensuring that easy sessions are genuinely easy rather than the moderate-hard pace that many runners default to on recovery days.
The most common training mistake at any age is running too fast on easy days. For masters runners, this mistake is particularly costly because it compromises recovery from the sessions that actually produce adaptation. If your easy run pace does not feel genuinely comfortable, almost embarrassingly slow, you are probably running it too fast. A heart rate ceiling of 75 percent of maximum is a useful guide for easy running.
Growth hormone, which plays a central role in muscle repair and recovery, is primarily secreted during deep sleep. Its production declines with age but is significantly amplified by adequate sleep duration and quality. Masters runners who consistently sleep fewer than seven hours are working against their own recovery in a way that younger runners can partially absorb but older athletes cannot.
The Non-Negotiable Addition
Strength training goes from useful to essential after 40. The evidence on this is unambiguous. Masters runners who incorporate two strength sessions per week demonstrate better running economy, lower injury rates, and slower age-related performance decline than those who run only.
The focus for runners should be on compound movements that translate to running: single-leg squats and lunges, hip hinges and deadlifts, calf raises, hip abduction, and core stability. The goal is not to build a physique but to maintain the neuromuscular strength and joint stability that running depends on.
Strength sessions for runners do not need to be long. Two 30 to 45-minute sessions per week, done consistently, produce meaningful results. The most important thing is starting. Many masters runners who have avoided the gym for years find that adding strength work produces faster improvements in their running than adding more mileage.
VO2 max declines with age, but running economy, how efficiently you use the oxygen you have, can be maintained and even improved well into the masters years with the right training. Strength work, strides, and a small amount of high-intensity interval work all contribute to maintaining economy. Masters runners who let running economy decline alongside VO2 max deteriorate faster than those who actively maintain it.
Making It Work
The structural changes that benefit most masters runners come down to a few clear principles applied consistently.
Run four to five days per week rather than six or seven, with deliberate recovery days in between. When you do run, polarise the effort: easy days genuinely easy, hard days genuinely hard. Avoid the grey zone of moderate effort that accumulates fatigue without producing the adaptations of high-intensity work.
Extend your training cycles. A younger runner might peak for a marathon on a 16-week block. A masters runner often benefits from 20 to 24 weeks, giving more time to build mileage gradually without the risk of overload that comes with rapid progression.
Be honest about injury signals. Masters runners tend to have less margin between a minor niggle and a full injury than younger athletes. Addressing discomfort early, with a training modification or a physio appointment, prevents the weeks-long setbacks that come from running through warning signs. Your coach is there to help you make those calls correctly.
JM Coaching's dedicated masters coaching programme is built around these principles, with coaches who understand the specific demands of training runners over 40 and the adjustments that make training sustainable over the long term.
Common Questions
Yes, and many runners do. Runners who come to the sport later in life or who have previously undertrained have significant room for improvement beyond 40. Even experienced runners can improve through better training structure, smarter recovery, strength work, and coaching. The rate of physiological decline is real but slow, and it can be substantially outpaced by improvements in training quality.
Most masters runners train well on four to five days per week, with at least two full rest or cross-training days to support recovery. More important than the number of days is the quality of recovery between sessions.
Yes. After 40, age-related muscle loss accelerates and its effects on running economy, injury resilience, and power become more significant. Two strength sessions per week focused on compound movements and single-leg work are widely recommended. The evidence is consistent: strength-trained masters runners are faster and more injury-resistant.
Generally yes. Research suggests masters runners take 30 to 50 percent longer to recover from hard sessions and races than younger runners. Hard sessions need to be spaced further apart and easy days need to be genuinely easy.
This depends entirely on training background and fitness. Well-trained 50-year-old runners regularly finish between 3:30 and 4:30. Runners new to the sport in their 50s can target sub-5 hours as an initial goal. Age-graded calculators provide a useful benchmark for comparing performances across age groups.
Summary
Running after 40 requires a different approach, not less ambition. The runners who struggle are the ones who kept doing exactly what they did in their 30s and were surprised when it stopped working. The runners who continue to improve are those who understood the physiological changes, added strength work, prioritised recovery, and adjusted the structure of their training without reducing the quality of it. Improvement is absolutely available. It just requires a smarter approach.
JM Coaching's masters coaching programme is designed specifically for runners over 40, with training structures, recovery protocols, and coach expertise matched to what masters athletes actually need. Get in touch if you want to find out whether it could be the right fit for you.
Founder of JM Coaching, 2:08:45 marathon runner and Great Britain international. Coaching runners of all abilities since 2013. Read his full profile.
Specifically designed for athletes over 40. Smarter recovery, strength integration, and long-term performance.
Masters Coaching