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You can hit balls from November into early March and walk out in April with the same miss. The swing didn't forget. Often the body ran out of turn, and the club followed.
A blog can't diagnose you. A screen description is not a screen. Two limits a TPI screen is built to find are hip internal rotation and thoracic rotation. Here is what those tests look for, and what the research actually found.
The hip has to turn inward
Internal rotation is the thigh turning inward in the hip socket. The swing uses it on both sides. When the hip doesn't share the turn, the low back may be asked to cover the difference.
Kim, You, Kwon, and Yi compared professional men with hip internal rotation under 20 degrees with those at 30 degrees or more. The limited group flexed and twisted the low back more during the swing, side-bent more to the right, and tilted the pelvis farther backward. They also had weaker internal rotators and tighter iliopsoas and hamstrings. That is an association, not a cause, and the study was reported in an abstract only.
Vad and colleagues measured 42 professional men. Thirty-three percent had low back pain longer than two weeks that had affected their play in the prior year. That history lined up with less lead-hip internal rotation, a less mobile lead hip on the FABERE test, and less lumbar extension. It did not line up with toe-touch distance. A toe-touch can miss the hip limit that matters to a golf swing. This was an abstract-only report, and the finding is an association.
Hamada and colleagues showed why range work and range balls are different in 2023. A mobility session raised passive lead-hip internal rotation from 28.7 to 35.4 degrees and active rotation from 27.4 to 34.4. The angle golfers used in the swing rose only from 15.7 to 16.9 degrees. Swing practice did not raise it. Golfers whose lead hip turned more during the swing tended to rotate the lower lumbar spine less, with a correlation of −0.522.
A short mobility session changed the hip that day, but most of the new motion stayed on the table. Training means earning the motion, then getting strong and controlled enough to use it while the pelvis stays under you. Stretch what is stiff. Strengthen the internal rotators and build control around the new range.
The upper back has to turn, too
The thoracic spine is the upper back, ribs included. It is built to rotate. The low back is a poor place to borrow twist from.
TPI's screens fit in one idea. The lower-quarter test looks for at least 60 degrees of pelvic rotation each way. The seated trunk test looks for the chest to pass 45 degrees both ways. The torso rotation test uses a quiet lower body to separate available mobility from control. A screen explains a pattern. It does not predict the swing. If the upper back won't turn, or the golfer can't control the turn without the hips or low back helping, the training question is different from simply adding stretches.
Use the off-season well
Northern Indiana gives you a useful window from November to early March. If the hip is short, the work may be hip rotation, rotator strength, hip-flexor and hamstring length, and rotation while the pelvis stays quiet. If the upper back is short, the work starts with the seated turn and then carries into golf posture. If you can make the position only when someone holds you, we train control instead of another stretch.
I don't change your swing, and I don't replace your pro. If your body can already make the position, the fix belongs with the person who teaches your swing. If it can't, more range balls may only rehearse the workaround.
An assessment separates those possibilities. You get the visual findings on the spot, and the written summary is sent afterward. Training after that, if you want it, is one-on-one or the group classes Bare Fitness already runs. Adults cap at 12. Youth, ages 9 to 18, cap at 10.
I'm Chris Windbigler, TPI Level 1, working toward TPI Fitness Level 2, after 21 years in the Navy. Bare Fitness is at 21269 Buckingham Rd, Elkhart, IN 46516. Call or text (574) 307-7123, or start at https://barefitness.fit/golf-fitness-elkhart.