Telehealth / national (self/partner-administered on a padded table or plinth with coached guidance)
Trunk-extensor endurance (Biering-Sørensen) + McGill torso-balance ratio screen — telehealth / national.
Screen for back pain and red flags, then time the trunk extensor and flexor endurance holds. Read all of it
Not funded yet. Settles as earned credit, $220 proposed.
Proof it takes, the deadline, the level
- ProofPre-test back-pain/red-flag screen cleared or routed + the Biering-Sorensen extensor hold time + the McGill flexor/side-bridge hold times + the computed endurance ratios/left-right symmetry + a clinician or physical therapist referral for any red flag
- Open until2026-12-28
- Levelintermediate
All of it: the words, the place, the proof
Screen for back pain and red flags, then time the trunk extensor and flexor endurance holds. Low-back injury is the trades' single costliest capacity loss, yet almost nobody measures the thing that actually predicts it before it happens. The Biering-Sørensen trunk-extensor hold, paired with McGill's flexor and side-bridge holds, catches a specific and modifiable risk pattern: an imbalance between the muscles that flex, extend, and side-bend the trunk, which predicts first-time low-back trouble years in advance (Biering-Sørensen 1984; McGill 1999). Anyone with current back pain is screened OUT and routed to a clinician first, this is a prevention tool for people who don't hurt yet, never a test to push through pain.
Fund it for $220. The receipt lands onchain once the proof is approved.
How this work is done
How this work is done
A documented method, so this packet comes out the same whoever does it.
Bring
- a padded table or plinth with a way to fix the hips and legs (strap or a partner holding the ankles)
- a stopwatch or timer
- a second person to spot and to hold the ankles or feet during each hold
- tablet or clipboard with the pre-test screen and the four hold-time recording sheet
- a firm mat for the flexor curl-up and side-bridge holds
Steps
- 1. Administer the pre-test screen before any positioning: current low-back pain of any intensity, radiating leg pain or numbness, a back injury within the past 6 weeks, unexplained weight loss, fever, saddle numbness, a new bowel or bladder change, prior spinal fracture or surgery, or uncontrolled disease. Any positive answer routes out of testing entirely to a clinician or physical therapist; do not position the person for any hold.
- 2. Confirm a spotter is present for every hold. Never run this test without a spotter.
- 3. Position the person prone with the upper body unsupported off the table edge, hips and legs fixed, torso held horizontal for the Biering-Sorensen hold. Start the timer and stop it the moment the torso drops from horizontal, the person reports pain rather than fatigue, or the person asks to stop; record the hold time and the stop reason.
- 4. Run the McGill trunk-flexor curl-up hold: record the hold time and stop reason using the same stop rule.
- 5. Run the McGill side-bridge hold on the left side, then the right side: record each hold time and stop reason using the same stop rule.
- 6. Compute the flexor to extensor ratio, the side-bridge to extensor ratio on both sides, and the left to right side-bridge symmetry, and compare each to McGill's normative targets (flexor to extensor under about 1.0, side-bridge to extensor under about 0.75) as a risk-pattern signal, never a diagnosis.
- 7. Enter the pre-test screen result, all four hold times and stop reasons, and the computed ratios into the record; sign. Stop immediately and do not continue to the next hold if the person reports pain, numbness, tingling, or dizziness at any point.
What counts as done
- Pre-test back-pain/red-flag screen completed and recorded BEFORE any positioning; any positive flag routes to a clinician or physical therapist and the test is not performed
- All four hold times recorded (Biering-Sørensen extensor, McGill flexor curl-up, side-bridge left, side-bridge right) with the stop reason for each
- Flexor:extensor and side-bridge:extensor ratios computed and compared to McGill's normative targets, plus left:right side-bridge symmetry, as a risk-pattern signal, not a diagnosis
- A ratio-targeted McGill 'big three' training plan recorded, sized to the weakest link identified, plus a retest date
Proof is measured against these, not judged by taste.
What is promised, and what is not
Three separate acts, never one: a vote is a free signed preference that moves no money; a pledge is free signed backing intent, balance-checked, that moves no money and never marks the packet funded; funding is a real payment that backs the wage. Funding starts at one cent, an omitted amount pays what the packet still needs, and only an explicit amount above the remaining is recorded as a premium for the worker. Money settles only on accepted proof. An agent can fund it in one x402 call: POST /nurture/fund {"workId":"WORK_1788107582815_d9br95k","funderWallet":"0xYOU"}.
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Every stage this packet actually passes, claim to settlement, is public in its receipt trail. A stage that has not happened is not claimed.
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Other acts: vote, pledge, fund
Packet WORK_1788107582815_d9br95k