Why Speed, Agility & Power Training Matters for You

A Guide for Peak Longevity Clients  

Dear Client,

You may have wondered why our sessions focus so heavily on speed, agility, and power rather than slow, traditional strength training. The answer lies in some remarkable — and urgent — neuroscience about how the human body ages. This letter explains what is happening inside your nervous system and muscles, why our training approach directly addresses it, and how nutrition and lifestyle choices can amplify your results.

What Aging Does to Your Nervous System

Most people assume that aging primarily means losing muscle. The more important story is what happens to your motor neurons — the nerve cells in your spinal cord that send signals to your muscles. You were born with a fixed population of motor neurons that cannot meaningfully regenerate. After age 60, you lose roughly 1% of these neurons every year, accelerating further after 70. By age 75, the average sedentary person has lost between 30 and 50% of their original fast motor neuron population.

Fast motor neurons are the ones responsible for quick, explosive, and reactive movements — exactly the type needed to catch yourself from a fall. When these neurons die, their orphaned muscle fibers get taken over by slower neighboring neurons that cannot fire at the speeds needed for fast reactions. The muscle fiber functionally becomes slow. This is a one-way process that cannot be fully reversed — but it can be dramatically slowed.

Why Power Declines Faster Than Strength

This is one of the most important and least understood facts in aging physiology. Power — the ability to produce force quickly — declines at roughly 3 to 4% per year after 50, while strength declines at only 1 to 2% per year. The reason is that power depends almost entirely on your nervous system’s speed and timing, while strength is more forgiving of neural decline because slow movements allow more time to recruit muscle.

In explosive movements, the entire contraction is over in 50 to 200 milliseconds — before slower muscle fibers can even contribute meaningfully. This is the critical window for fall prevention. A stumble recovery happens in under 200 milliseconds. Traditional slow strength training simply does not train this window. Our sessions do.

What Our Training Actually Does

Preserves Fast Motor Neurons

High-velocity and high-effort training keeps fast motor neurons metabolically active. These neurons require significant energy to maintain their large cell bodies and long axons. Chronic inactivity reduces their metabolic support, accelerating their death. Our training provides the biological stimulus — including neurotrophic factors like BDNF — that keeps them alive and functional.

Improves Neural Drive

Beyond preserving neurons, our training improves how effectively your brain uses the neurons you have. Key adaptations include:

• Increased motor unit recruitment — accessing more muscle fibers per contraction
• Improved rate coding — motor neurons firing faster for quicker force production
• Better motor unit synchronization — fibers activating together more effectively
• Enhanced Rate of Force Development (RFD) — faster force in that critical 200ms window

Maintains Muscle Architecture

Muscle thickness and fascicle angle — the structural components of muscle — serve as your reserve tank. While neural adaptations are our primary target, maintaining adequate muscle mass ensures there is enough contractile machinery to drive. These structural components detrain faster than neural qualities during periods of reduced activity, making consistency especially important.

How Often You Need to Train

Research on older adults provides clear guidance on training frequency:

• Two sessions per week is the optimal dose for ongoing gains and robust neural maintenance
• One session per week is a legitimate minimum for preserving neural and functional qualities
• Between sessions, a combination of moderate-pace walking and brief fast-stepping activities supports mitochondrial health and keeps fast motor units gently active
• At least 48 hours of recovery between power sessions is recommended — your nervous system and muscles require this time to fully adapt and rebuild

The encouraging news from research is that neural adaptations — the ones most critical for your functional independence — are remarkably durable. Studies show they remain largely intact for up to 12 weeks even after training stops, while structural muscle gains are more vulnerable to short breaks. This means that even during travel or illness, much of what we have built together is preserved.

When to Start and Is It Ever Too Late

The most important window for intervention is roughly ages 55 to 70, when fast motor neuron loss is accelerating but not yet catastrophic, and when both neural and structural adaptations are still fully achievable. However, research consistently shows meaningful adaptation in adults in their 80s and 90s — it is never too late to generate real improvement.

A trained 70-year-old can have a neuromuscular profile resembling a sedentary 50-year-old. That gap represents approximately a decade of additional functional independence, reduced fall risk, and preserved quality of life. The best time to start was 30. The second best time is today.

Nutrition to Support Your Training

What you eat directly influences how well your nervous system and muscles respond to training. The following evidence-based recommendations are particularly important for our population:

Protein — The Most Critical and Most Commonly Inadequate

Older adults develop anabolic resistance — the muscle-building response to protein blunts with age. This means you need more protein than younger people, not less. Research supports 1.2 to 1.6 grams of protein per kilogram of body weight daily, with individual meals containing 30 to 40 grams of high-quality protein to trigger muscle protein synthesis effectively. Consistent adequate protein intake across all meals matters more than any single supplement.

Creatine Monohydrate

Creatine is the most evidence-supported supplement for our population. At 3 to 5 grams daily it increases the energy available for explosive efforts, helps preserve muscle mass during periods of reduced activity, and has emerging evidence for neuroprotective effects relevant to motor neuron health. Decades of research confirm its safety. Creatine monohydrate remains the gold standard — expensive alternatives offer no additional benefit.

Mediterranean Diet Pattern

Chronic low-grade inflammation — common in aging — directly drives muscle loss and motor neuron vulnerability. The Mediterranean dietary pattern addresses this systemic environment through anti-inflammatory foods including olive oil, fatty fish, vegetables, legumes, and whole grains. It also supports the cardiovascular infrastructure that your motor neurons depend on for oxygen and nutrient delivery.

Vitamin D

An estimated 40 to 80% of older adults are deficient in vitamin D, which has direct receptors on muscle fibers and motor neurons. Low vitamin D independently increases fall risk and reduces the explosive muscle qualities we are training. Testing your 25-hydroxyvitamin D blood level and targeting 40 to 60 ng/mL through supplementation is a high-priority recommendation. In our Cleveland latitude, sun exposure alone cannot maintain adequate levels from October through

April.

Omega-3 Fatty Acids

At 2 to 3 grams of EPA and DHA daily — from fatty fish or supplementation — omega-3s support muscle protein synthesis, reduce muscle loss during inactivity, and help preserve the neuromuscular junction integrity that connects your nerves to your muscles.

Additional Priorities

• Magnesium (300-400mg daily) — required for ATP synthesis and neuromuscular function; commonly deficient in Western diets
• Proactive hydration — older adults have a blunted thirst mechanism and are often mildly dehydrated, measurably reducing power output
• Collagen peptides (15-20g with vitamin C, 30-60 minutes before training) — emerging evidence for supporting tendon and connective tissue health

Outdoor Training and Sun Exposure

When weather permits, training outdoors provides benefits beyond vitamin D synthesis — including nitric oxide release from skin that improves vascular function, circadian rhythm regulation that supports sleep and recovery, and mood-supporting effects that improve long-term adherence. In our Cleveland climate, outdoor training is a valuable seasonal complement to yearround supplementation, not a replacement for it.

The Bottom Line

Every year without high-velocity training, your body loses fast motor neurons that cannot be replaced. Every year of consistent training with us, you are slowing that loss, maximizing the function of what remains, and building a reserve of neural and muscular capacity that directly protects your independence, your balance, and your quality of life.

The research is clear: this type of training is among the most powerful interventions known for healthy aging. I’m grateful to be doing this work with you.

With care,

Brian Richards, PT, DPT

Founder | Peak Longevity PT