MOBILITY AFTER 50: WHAT THE MOVEMENT-SCREEN DATA SHOWS, AND THE TRIALS NOBODY RAN

Movement-screen scores in active adults aged 52 to 83 declined with age, declined with higher BMI, and rose with activity level. The largest fall-prevention review ever assembled found no trials at all comparing flexibility exercise against a control group. Here is what the mobility evidence actually covers, what it does not, and the warm-up sequence from Chapter 9 of Battle Hard After 50.

Flexibility and Mobility Are Not the Same Measurement

Flexibility is passive range of motion — the range a joint can be moved through by an outside force, someone pushing your leg further into a stretch, or your own bodyweight relaxing into a held position. Mobility, the way this book uses the word, is active range of motion: the range you can move through and control under your own muscular effort.

The distinction matters because the two can come apart. A man can be flexible lying on a mat and still lack the control to rack a barbell overhead or drop into a real squat, because the second requires strength through the range, not just the range itself. Chapter 2's chair sit-and-reach test gives you one data point here — a posterior-chain and hamstring flexibility measure that says nothing about hip rotation, ankle range, or thoracic spine.

What the Movement-Screen Study Measured

Mitchell and colleagues at Brigham Young University ran the Functional Movement Screen — a standardized seven-test battery of movement quality — on 97 older active adults, 53 men and 44 women, aged 52 to 83. This was an observational, cross-sectional study, so it reports associations at a single point in time, not what changes when someone trains.

The 50-54 age group scored highest on all seven tests. The 75-and-over group scored lowest on most of them. The pairwise correlations the authors reported were all significant at p < 0.01: total FMS score against age r = −0.531, against BMI r = −0.270, and against self-reported activity level r = 0.287. Participants in the normal-weight and overweight groups performed no differently from each other; both performed better than the obese group. Of the 97 participants, 54 had at least one left-right asymmetry.

Two things about this study are worth keeping in view. First, these were active older adults, not sedentary ones — staying generally active did not flatten the age association. Second, the authors were explicit about the limit of their own finding. Their concluding line calls for future research to evaluate whether a higher total FMS score is related to fewer falls or injuries in older people. That connection was not something this study established.

The Training Trial, and What Its Outcome Actually Was

El-Hajjami Nachit and colleagues randomized 60 community-dwelling older adults to a 12-week CrossFit-adapted program or a control group, with sample size calculated a priori for a medium effect. The CrossFit-adapted group improved on the Timed Up and Go test from 9.83 ± 1.3 seconds to 8.74 ± 1.1 seconds (p = 0.002). Lower-limb power improved significantly across the chair-stand, stair-ascent, and stair-descent tests (p < 0.001 for all). Balance scores also improved relative to control.

Read the outcome precisely. Timed Up and Go is a functional-mobility test — stand up, walk three meters, turn, walk back, sit down. It is not a measure of joint range of motion, and it is not the chair sit-and-reach. This trial is evidence that scaled functional training moved a functional-mobility measure in this population over twelve weeks. It did not compare that program head-to-head against isolated stretching, so it says nothing about what stretching alone would have done.

The Gap Nobody Advertises

The Cochrane review of exercise for preventing falls pooled 108 randomized trials and 23,407 community-dwelling participants across 25 countries, average age 76, 77% women. Balance and functional exercise reduced the rate of falls by 24% (RaR 0.76, 95% CI 0.70 to 0.81; 39 studies; high-certainty evidence). Multiple exercise types together — most commonly balance and functional plus resistance — probably reduced the rate by 34% (RaR 0.66, 95% CI 0.50 to 0.88; 11 studies; moderate certainty).

And then this sentence, from the same review: no trials compared flexibility or endurance exercise versus control. Not weak trials. Not mixed trials. None. The most heavily pooled evidence base in this field has nothing to say about stretching as a standalone fall-prevention intervention, because the trials were never run. That review is covered in full in a separate post on what exercise type the fall evidence supports.

So the defensible position here is narrow. Movement quality is associated with age, weight, and activity level in a cross-sectional sample. Functional training moved a functional-mobility test in one 12-week randomized trial of 60 people. Whether stretching by itself changes hard outcomes has not been tested against a control.

The Protocol

Chapter 9 prioritizes three areas: hip mobility, ankle dorsiflexion, and thoracic spine rotation. This is a WPP programming choice, based on what is load-bearing in the Push, Pull, Squat, Hinge, power, and carry work the rest of the book asks for. It is not a claim that research has identified these as the three most commonly restricted areas in men.

The standard the chapter works toward:

• Mission standard — a full bodyweight overhead squat: arms overhead, hips below parallel, heels flat, chest up, holding the bottom position under control for a full breath.
• Field version — a goblet-hold squat, light weight or clasped hands at chest height, same depth and control target, removing the shoulder-mobility demand while hip and ankle range builds.
• Scale down — a box or chair squat to a comfortable depth, heels down and chest up, without chasing depth.
• Progress — move up when you can hold the bottom position for five seconds, heels flat, knees not caving, lower back not rounding. That five-second mark is a WPP benchmark, not a research-derived figure.

The warm-up sequence below runs before any strength, power, or carry session — roughly ten minutes once it is familiar. The drills, rep counts, and hold times are WPP programming standards, not figures drawn from the studies above.

• Hips — kneeling hip flexor stretch with a slight posterior pelvic tilt, 30 to 45 seconds per side, then ten controlled hip circles per direction from half-kneeling.
• Ankles — knee-to-wall dorsiflexion drill, driving the knee forward over a fixed foot without the heel lifting, ten reps per side, then fifteen slow calf raises through full range.
• Thoracic spine — open-book rotations lying on your side, eight to ten slow reps per side, then cat-cow emphasizing the upper back rather than the lower back, which is where the movement tends to default.

Mobility work stays bodyweight by design. "Loading up" here means attaching the sequence to every session rather than treating it as an occasional separate practice.

Retesting

Retest the Chapter 2 chair sit-and-reach on the same interval as the other assessments, and reassess your squat depth against the standard above. Both, not one. The sit-and-reach cannot report on hip, ankle, or thoracic range, and no study cited here measured that specific test as an outcome — so a flat retest number is not evidence the work did nothing, and a moved one is not proof it did. Track the trend across two or three retests rather than reading a single number. One test can no more represent every joint than one lift can represent every kind of strength.

Battle Hard. — Will Power

References

1. Mitchell UH, Johnson AW, Vehrs PR, Feland JB, Hilton SC. Performance on the Functional Movement Screen in older active adults. J Sport Health Sci. 2016;5(1):119-125. PMID 30356515.
2. El-Hajjami Nachit L, León-Morillas F, Bergamin M, Gobbo S, Durgut E, Cruz-Díaz D. Effects of a 12-week CrossFit-adapted program on balance, functional mobility, and lower-limb power in community-dwelling older adults: a randomized controlled trial. Healthcare (Basel). 2025;13(24):3294. PMID 41464363.
3. Sherrington C, Fairhall NJ, Wallbank GK, et al. Exercise for preventing falls in older people living in the community. Cochrane Database Syst Rev. 2019;1(1):CD012424. PMID 30703272.