The Chicken-Wing Kip
Dev is 27, four months into CrossFit, and can do 4 strict pull-ups on a good day with a hollow body. He has been teaching himself to kip from videos. His kip looks like this: the hips barely move, the legs kick one at a time, and his right arm bends first and hooks over the bar while the left stays straighter - the classic chicken wing. He reports no shoulder pain, but he does have a history of a right shoulder 'tweak' from college baseball. Today's workout is 5 rounds of 12 pull-ups plus a 400 m run with an 18-minute cap, and he plans to kip all 60 reps because 'jumping pull-ups look soft.'
1. What readiness criteria do you use before letting an athlete kip, and does Dev meet them?
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Common criteria. Roughly 5 or more strict pull-ups with a controlled hollow and arch, the ability to hold a hollow position and an arch position on the bar, active shoulders at the bottom, and no shoulder pain. Some coaches want more strict volume; the principle is that the strict work builds the strength and position the kip depends on.
Does Dev meet them? He is borderline on strict strength and fails the position tests: he cannot demonstrate a controlled hollow-to-arch swing with both legs moving together. His 4 strict reps are also on a 'good day,' which is not a reliable base.
Why the criteria matter. The kip is not a shortcut around pulling strength; it is a swing that redirects momentum into a pull. Without the hollow-arch control, the body finds another way over the bar - an asymmetric arm pull, which is exactly what he is doing and exactly what his shoulder history makes risky.
Decision. No kipping in the workout today; kip practice as skill work afterward on fresh shoulders.
2. What is causing the chicken wing, and what is the actual risk if he keeps kipping 60 reps today?
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The cause is two problems compounding. First, insufficient strict pulling strength, so his arms have to do work the swing should do. Second, no coordinated hollow-arch swing: hips and legs should move as one unit and drive the pull, but his legs kick separately and his hips are static, so the pull is all arm and lat on one side. The arm that bends first is the one doing more work.
The risk. Repeated asymmetric loading at the bottom of a hang, with the shoulder internally rotated and the elbow flexed, loads the front of the shoulder and the elbow in a compromised position. It will not necessarily hurt today; it accumulates. A 'tweak' history in that shoulder raises the stakes.
Under fatigue. At rep 40 of 60, with heart rate high, the asymmetry gets worse, not better. This is a scenario where the athlete feels fine and the tissue is being loaded badly.
Coaching point. Fix the swing first, then the pull, then the volume.
3. What do you put him on for today's workout, and what does the next six weeks look like?
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Today. Banded strict pull-ups or jumping pull-ups at a band or box height that lets him complete 12 reps in two sets with a controlled lower. Run as prescribed. Practice kipping afterward, not during, so fatigue does not re-teach the fault.
Next six weeks. Three pieces, worked twice a week outside the metcon:
- Swing mechanics: hollow and arch holds on the bar, then 3 sets of 5 controlled swings with legs moving together.
- Strength: strict pull-up volume - 5 sets of 3-4, or negatives - plus scap pull-ups and ring rows.
- Skill: banded kip swings, then kipping pull-ups one at a time with a coach watching for symmetry.
Recheck. Test 5 unbroken strict pull-ups and 5 symmetrical kip swings before adding kipping to a metcon. Then start with small sets inside workouts - 3 to 5 reps - not 60 in one session.
Why. He needs a progression with a measurable gate, not a blanket 'no.' The gate protects his shoulder and gives him something to chase.