Frequently Asked Questions About Simon Hill Living Proof 12-Week Protocol
22 answers covering everything from basics to advanced usage.
// Basics
What does 'Test — Intervene — Retest' actually mean?
It's the core three-phase loop of the protocol: first measure all 10 Truths to generate a quantified Longevity Score baseline, then apply 12 weeks of evidence-based lifestyle interventions, then retest every Truth under the same conditions. The delta between baseline and post-challenge score is the primary output — measurable proof the protocol worked, rather than a feeling of improvement.
What are the Four Key Systems and why do all of them matter?
The Four Key Systems are cardiovascular, metabolic, musculoskeletal, and psychological/emotional well-being. All 10 Truths map to one of these systems, and any health plan that ignores one is considered incomplete. This is why the protocol includes grip strength and a Flourishing Scale alongside blood work — longevity depends on more than just heart and metabolic health.
What is the Personal Fat Threshold?
Your Personal Fat Threshold is your genetically determined maximum capacity to store fat safely in subcutaneous tissue. Once exceeded, fat spills into the liver, pancreas, and circulation as ectopic fat, driving insulin resistance, high triglycerides, elevated glucose and HbA1c, and eventually Type 2 diabetes. The four metabolic Truths serve as a window into whether you've crossed your personal threshold.
How do the Three Criteria for a Truth work?
Every metric in the 10 Truths must satisfy three criteria simultaneously: it must be a great predictor of longevity, it must be relatively easily measured, and it must be shiftable in a favorable direction with a specific evidence-based lifestyle protocol. This filter is why familiar-but-unactionable or hard-to-measure markers were excluded from the list.
// How To
How do I measure my blood pressure correctly at home?
Use an automatic cuff (e.g., Omron), rest quietly for 5 minutes first, keep legs uncrossed, and position the cuff at heart level. Aim for a 120/80 mmHg target. Correctly taken home measurements are more predictive of cardiovascular disease than office readings, which are inflated by the white coat effect. Take multiple readings for accuracy.
How do I test my VO2 Max without a lab?
Use the 20-metre beep/shuttle test: place two cones 20 metres apart, run between them paced by a free beep-test app, and record the level and shuttle number where you fail (miss two consecutive beeps). Convert the result to an estimated VO2 Max using a reference table. The field test correlates with directly measured VO2 Max at r=0.92.
How do I measure grip strength properly?
Buy a $20–$30 dynamometer, test each hand three times, take the average per hand, then adjust the result for your age and sex. Grip strength isn't about wrist strength itself — it proxies whole-body compound strength. From age 40, sedentary people lose 2–3% strength annually, but resistance training reverses this.
How do I improve my metabolic Truths?
If two or more metabolic Truths are suboptimal, you've likely exceeded your Personal Fat Threshold. The primary levers are energy balance (reducing energy toxicity) plus exercise to boost mitochondrial health. Weight loss of 10–15 kg typically normalizes markers in overweight individuals; even 7–8 kg can normalize them in people with normal BMI. Don't rely on BMI alone.
How do I improve my Flourishing Scale score?
Target the specific dimensions scoring low: invest in relationship depth and frequency, engage in structured service to others (volunteering, mentoring), and identify purposeful activities that produce genuine engagement. Keep time spent alone below 75% of waking hours. Research shows highly stressed people who are consistently of service don't show elevated mortality risk — service buffers stress.
Should I retest under the same conditions as my baseline?
Yes — repeat every test using the exact same protocols and conditions (same fasting state, same blood pressure resting procedure, same shuttle test setup) to ensure comparability. Inconsistent conditions introduce noise that can mask or fake improvement. Only then can the delta between baseline and post-challenge Longevity Score be trusted as real proof.
// Troubleshooting
My Longevity Score didn't move on one Truth after 12 weeks. What do I do?
Before concluding the intervention is ineffective, interrogate your adherence to the specific habit most directly linked to that Truth. For example, if VO2 Max didn't improve, confirm you actually hit the Zone 2/3 cardio target of 150 minutes per week. Most non-movement traces back to adherence gaps rather than the intervention failing.
What if my DEXA scan shows osteoporosis?
If your T-score is below −2.5 (osteoporosis), do not start jumping or jogging unsupervised — refer to a supervised bone health clinic first. High-impact bone-loading is beneficial but must be matched to baseline fracture risk. Postmenopausal women should also discuss pharmacotherapy such as estrogen therapy with a physician where not contraindicated. Bone responds even at 80–90, so it's never too late.
I have a normal BMI but poor metabolic markers. Is that possible?
Yes — 1 in 6 people with Type 2 diabetes have normal BMI. BMI is a poor proxy for metabolic health because your Personal Fat Threshold is individual. Trust the four metabolic Truths (triglycerides, waist-to-height ratio, fasting glucose, HbA1c) over the scale. Even a modest 7–8 kg loss can normalize markers in normal-BMI individuals who've exceeded their threshold.
I keep failing to sustain the habits. Am I doing something wrong?
Likely you're introducing too much too fast or demanding perfection. The protocol uses progressive habit stacking for a reason — start with one theme in week one and add one focus per week. It's also built for 70–80% adherence, so a slipped day isn't failure; abandoning the protocol after a slip is. Resume, don't restart.
// Comparisons
How does this compare to just getting an annual physical?
An annual physical typically checks LDL, weight, and blood pressure but rarely tests ApoB, Lp(a), VO2 Max, grip strength, bone density, or psychological flourishing. This protocol measures all 10 longevity-predictive Truths, calibrates targets to your risk profile, then structures a 12-week intervention and retests to prove change — turning a snapshot into a measurable improvement loop.
How is the Flourishing Scale better than ignoring mental health in a fitness plan?
The Harvard Study of Adult Development, with 80 years of follow-up, found relationship quality is a stronger predictor of happiness and longevity than LDL cholesterol, smoking, or income above ~$75,000. Ignoring emotional well-being leaves out one of the most powerful longevity variables. The Flourishing Scale gives it a quantified, trackable score alongside blood work.
How does waist-to-height ratio compare to BMI?
Waist-to-height ratio (waist circumference divided by height) is superior to BMI because it captures fat distribution and visceral adiposity, not just total weight. Increased waist-to-height ratio signals abdominal/visceral fat storage — a direct indicator that your Personal Fat Threshold may be exceeded. BMI misses metabolically unhealthy people at normal weight.
// Advanced
Is VO2 Max fixed by genetics or can I train it?
It's highly malleable through training, not fixed. Moving from 'low' to 'average' cardiorespiratory fitness halves your risk of death and cardiovascular disease, and it's achievable with 150 minutes per week of moderate-intensity Zone 2/3 exercise. Treating VO2 Max as genetically capped is a pitfall that costs one of the biggest available longevity gains.
Why should I test Lp(a) if I can't change it with lifestyle?
Because it defines your true baseline risk. Lp(a) is roughly 100% genetic and unmodifiable, but if it's elevated (above 30 mg/dL), your lifetime cardiovascular event risk rises 1–1.5x and your ApoB target must drop to under 50 mg/dL. You test it once, and the result recalibrates how aggressively you pursue the modifiable Truths.
Why does the protocol say bones are a 'savings account'?
Bone mineral density built in your 20s, 30s, and 40s determines fracture risk in later decades. Reserves accumulated early protect you when age-related loss accelerates. Musculoskeletal interventions work at any age — bone responds even at 80–90 — but the earlier you invest, the greater the compounding return, which is why the protocol urges early bone-loading exercise.
What exactly stimulates bone density versus muscle?
Bone density is stimulated by weight-bearing exercise with ground reaction force greater than walking — jogging, skipping, hopping — which activates osteoblast activity. Muscle and grip strength are stimulated by heavy compound lifts. In women, estrogen is the key mediating signal, so postmenopausal women often need resistance training plus possible pharmacotherapy discussion with a physician.
How does 'Service Attenuates Stress' work physiologically?
Research shows highly stressed people who are consistently of service to others do not show increased mortality risk, unlike highly stressed people who aren't of service. Being of service appears to buffer the physiological damage of chronic stress, likely through inflammation pathways. This makes structured service a modifiable longevity lever, not just a moral nicety.