There is a difference between a teenager slouching and an adult slouching.
It is gratifying, as a nagger [a skill learned from my mother] to constantly bug a teenager about slouching and watch them follow your advice and obtain great posture. Gone is the insecure 16 year old and in their place is the confident 19 year old.
One can’t help but to look upon that young adult and feel a sense of pride in the constant badgering that accomplished such a feat. And yet, the same adult is unable to fix their own posture. Braces, electronic reminders, Lenten resolutions, shock collars, etc. and nothing seems to stick. Sure they sit up taller for a while, but the head is still forward and the middle of the back begins to hurt. It is not lack of willpower, no matter how much one beats themselves up over their posture.
Something has changed.
The fundamental make-up of a teenager slouch verses an adult slouch is completely different. Until the adult is able to understand the difference, they will always have posture problems.
The Tissue is the Issue
The tissue isn’t the same. We joke as adults that, a child can stab themselves with a fork and watch themselves heal, but adults pull a muscle putting their belt on and two weeks later they still hurt. It is only funny because it is so true. A young person’s tissue just holds them together better.
Imagine a huge tent for a wedding that has a single large pole in the center. The cloth of the tent is new and taunt. The ropes and stakes that support the tent are strong. The whole structure is stable. Then someone runs into the center pole hard enough to make it wobbly. The tent as a whole is not as stable as it was, but because the cloth and the ropes and stakes are in such good condition, enough stability is maintained to make the tent functional. [This is the case of a young adult who begins to lose their bracing muscle strength.]
As the tent ages, the cloth begins to give a lot more. Tears easier and cannot be relied upon as much to provide stability. The ropes stiffen and become more brittle while the stakes bend. In an older tent, a wobbly center pole becomes an issue that must be dealt with if the tent is to stay up. [Please no comments on tent repair or stability, this is a parable on the aging body, not a treatise on tents.]
When injuries or bad positions occur, adolescents spring back into position like a Weeble. [“Webbles wobble but they don’t fall down.”] Adult tissue is like the part of the couch that one hates to sit on, because they sink in way too far. It is just not the same tissue.
Teens: Building Stability Amid Growth
Picture a group of 10-year-olds fumbling through an agility ladder—they look uncoordinated, right? Fast-forward to age 20, and they’ve nailed both stability and coordination. That’s the Stability Gap™ from my book Uprise: The Body guitar Theory and Back pain Liberation the lag in building postural stability, which boils down to Bracing muscle strength.
A 10-year-old might stand tall with perfect posture, but they lack the extra muscle power for demanding moves. Throw in rapid growth—gaining height and weight—and everything shifts, demanding constant upgrades in Bracing muscle strength.
Take young gymnasts: At 8-10, they sprint and flip like pros. But a few years later, twice as fast and heavy? Injuries strike because their Bracing muscles haven’t kept pace.
In normal development, kids build stability and coordination hand-in-hand, thanks to our nervous system’s built-in upgrades. Posture glitches in teens? Studies say they don’t predict adult issues—they’re not red flags like in grown-ups. But they could cap future coordination potential. So, yeah, your nagging might pay off!
Adults: The Stability Showdown
We’ve got the coordination part, but stability? That’s the real battle. Enter The Body Guitar Theory: Your spine stabilizes via two rival muscle groups.
- Bracing muscles (the wood of the guitar): Spring-like, short-segment stabilizers in the back of the spine that kick in when relaxed, pulling you snug into joints for stability.
- String muscles (the strings of the guitar): Long-segment pullers mostly in the front of the spine that fire up in fight-or-flight mode, dominating during sprints.
Mammals are the only species with muscular diaphragms, with String muscles tied directly into the diaphragm dominating. But humans are unique—we’re the only mammals relaxing upright. In a chill upright mode, Bracing muscles rule.
Kids swap between chest breathing (locking diaphragm for String muscles to contract more) and belly breathing (unlocking the diaphragm for Bracing muscles to contract more) effortlessly. Adults? Stress or endless sitting tips the scales toward String muscle dominance, losing our human-like difference. Worse, Bracing muscles get shut down by three culprits: back pain, string muscle dominance, or slouchy posture.
Injury hits? Bracing muscles bail to avoid pain, handing reins to String muscles, which inhibits the Bracing muscles more. String muscles fatigue fast, forcing compensatory slouches that inhibit Bracing muscles even more. Pain fades, but the imbalance lingers. Poor posture exposes and amplifies it, trapping you in instability until… boom, more pain.
Bottom line: For teens, bad posture blocks peak coordination. For adults, it’s a warning siren of deeper trouble ahead.