Movement Performance Institute
2101 E. El Segundo Blvd. Suite 101
El Segundo, CA 90245
All services referenced herein are for general information only and should not be interpreted as medical advice. Always consult your doctor before trying any new fitness routine.
© 2026 Stepp Up Fitness LLC
The Six Areas of Assessment - Expand Each for More Information
Your Body's Life Insurance
Starting around age 30, most adults lose roughly 3–5% of their muscle mass per decade, with that decline accelerating between ages 65 and 80 (Cleveland Clinic; Harvard Health). This isn't cosmetic — low relative muscle mass, a condition called sarcopenia, is independently linked to higher mortality and fall risk, regardless of how much someone weighs.
The good news: unlike a lot of aging markers, strength decline responds dramatically to targeted training — even starting later in life.
A real strength assessment goes beyond "how much can you lift." Clinical-grade testing looks at isometric force output in the muscle groups most responsible for daily function and fall prevention — hips, glutes, and quadriceps — measured in both seated and prone positions using dynamometry equipment (like a HUMAC NORM system), not just a hand grip or a bathroom scale.
This gives you a precise, side-by-side comparison to normative data for your age and sex — not just "you seem strong for your age."
The Secret Predictor of Longevity
It sounds almost too simple, but gait speed — literally, how fast you walk — is one of the most well-studied predictors of longevity in the aging research literature. A landmark pooled analysis of 34,485 older adults found that every 0.1 meter-per-second increase in gait speed was associated with a 12% lower risk of death, a relationship that held consistently across nine separate long-term studies (Studenski et al., JAMA, 2011). Few single measurements in aging research carry that much predictive power.
Gait isn't just speed, though — it reflects the combined output of strength, balance, joint mobility, and neuromuscular coordination all working together in real time, which is part of why it's such a strong composite signal of overall function.
Clinical gait analysis uses instrumented treadmills with pressure-sensing plates (Zebris-style systems are common) to capture short bouts of walking and break down step symmetry, stride length, and walking speed with far more precision than a stopwatch and a hallway.
The Strongest Predictor of Long-Term Health
If you could only measure one thing to predict how long someone will live, cardiologists and exercise physiologists increasingly point to the same answer: VO2max, a measure of how efficiently your body uses oxygen during exertion. Research consistently shows it's one of the strongest independent predictors of all-cause mortality in otherwise healthy adults, even after controlling for other risk factors.
A 2018 Cleveland Clinic study of over 120,000 adults found that people with elite cardiorespiratory fitness had an 80% lower risk of death than those with the lowest fitness levels. The researchers also found no upper limit to the benefit; even going from 'high' to 'elite' fitness kept reducing risk (Mandsager et al., JAMA Network Open, 2018). And critically, you don't need to be an athlete to benefit — the biggest longevity gains tend to come from moving out of the lowest fitness bracket, not from elite athletes shaving seconds off a 5K.
Real VO2max testing isn't a fitness-tracker estimate, so put your smart watch away. Testing your true VO2max involves a graded treadmill protocol while a lab-grade metabolic cart analyzes the oxygen and carbon dioxide in every breath. That's the gold-standard method, and it's what separates a clinical longevity assessment from a guess based on resting heart rate.
Your Scale Doesn't Tell the Whole Story
A UCLA study following 3,659 older adults found that relative muscle mass independently predicted survival, while BMI — the number most people fixate on — did not reliably predict mortality at all (Srikanthan & Karlamangla, American Journal of Medicine, 2014).
This is why two 68-year-olds who are both '170 pounds' can have entirely different risk profiles, and why body composition testing matters more the older you get.
Modern body composition testing uses either bioelectrical impedance or DEXA full-body scans.
Bioelectrical impedance is a quick scan (via a device like InBody) that sends a mild electrical current through the body to distinguish muscle, fat, and water.
DEXA scans are a seven-minute, fully clothed full-body X-ray that gives you precise numbers for how much fat, muscle, and bone mass you have.
The Overlooked Predictor of Longevity
Balance rarely gets attention until it fails — but falls are the leading cause of injury-related death among adults 65 and older, and the age-adjusted fall death rate rose 21% between 2018 and 2024 (CDC, 2026). It's not a niche fitness metric; it's arguably the most consequential of the six assessments in terms of immediate, life-altering risk.
Balance touches nearly every daily movement: standing up from a chair, walking on uneven ground, reaching for something on a shelf. It quietly underlies almost everything else on this list.
Balance is typically assessed using instrumented platforms that measure postural sway and stability during both static (standing) and dynamic (moving) tasks — giving an objective score rather than a subjective "how steady do you feel" check.
More Than Just Mental Quickness
In a study following adults aged 70–90, researchers found that slower and more inconsistent reaction time predicted a 50–60% increased risk of developing dementia within the following four years — a signal that showed up before other traditional cognitive symptoms did (Kochan et al., Sydney Memory and Ageing Study, American Journal of Geriatric Psychiatry).
It's also one of the more direct predictors of fall risk: a body that's strong and balanced still needs to react fast enough to catch a stumble before it becomes a fall.
Real reaction-time assessment goes beyond a phone app tapping game. Clinical testing typically includes an upper-body reaction test (reacting to visual cues on a reactive wall system) and a lower-body version that measures how quickly you can shift your weight from one foot to another in response to a stimulus — closer to the real-world mechanics of catching yourself from a trip.
The Second Pillar: what's happening on the inside. Our partner Dr. John Zheng of Top1ers has developed a blood testing panel that identifies hidden metabolic, hormonal, and inflammatory risks before symptoms affect your movement, performance, and longevity. You walk away with clear, actionable insights focused on optimal performance ranges—not just standard "disease-only" baselines.
Continued Support: Once you've completed your assessment, we offer custom, 1-on-1 personal training and physical therapy tailored to your unique results that will help reduce any deficits and strengthen your body both inside and out, putting you on a path toward living a long and active life.
"I'm very impressed with your program. It's inspiring to see people so engaged and passionate about their work."
-AYA client Philip H., 77 years old
The Assessment
"You know what's in your wealth account, but what about your health account?"
-AYA client Greg M., 57 years old
If you've researched longevity testing, you may be overwhelmed by the options. Genetic testing, saliva testing, stool microbiome analysis, 100+ blood testing panels, ultrasounds, EKG...the list is seemingly endless and exhausting. That's why we've pared it down to what actually matters. A simple, two-pillar diagnostic that's unique to the industry. It cuts through the noise and gives you understandable, actionable results that you can work on immediately.
The First Pillar: how you move on the outside. Developed by USC professors Dr. Christopher Powers and Dr. Todd Schroeder, along with NASM-certified personal trainer and senior fitness specialist Jeff Stepp, the Activate Your Age physical assessment combines DXA body-composition metrics, Parvomedics VO2Max data, and HUMAC NORM strength tests with clinically-researched mobility, balance, and reaction-time assessments to determine your body's physical longevity age.
