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16 amateur golfers, 4 clubs: an open vs straight foot position reduced lead-knee rotation 28%, compressive force 5%, and rotational torque 9% in a lab study.
Not an injury-prevention guarantee. Compare your full swings.
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Source note: Stokes et al. — Open Foot Stance Reduces Lead Knee Joint Loading During Golf Swing pubmed.ncbi.nlm.nih.gov/3758…
200 D1 softball slap attempts: the preparatory step lasted 0.06–0.40 sec.
Longer preparation correlated with hip speed (r=.44) and bat speed (r=.35)—but also longer total time.
Compare the first step, not just contact.
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Source note: Lund et al. — Kinematic Analysis of the Slap Hitting Technique in Division I Softball Players thesportjournal.org/article/…
927 MLB pitchers: sidearm <33.5°, three-quarter 33.5–44.4°, overhand >44.4°.
A 2026 study found different performance and injury patterns—not proof that changing a youth pitcher's slot prevents injury.
Compare their own deliveries.
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Source: Dillon et al., 2026 — Orthopaedic Journal of Sports Medicine journals.sagepub.com/doi/10.…
Flat vs 5° uphill/downhill.
In 12 mid-handicap golfers, slope changed center-of-pressure movement during the backswing. Players adjusted their setup but didn’t maintain that adaptation through the swing.
Compare your movement across lies.
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53 youth softball pitchers averaged ~55.9 mph. Peak vertical force under the stride foot averaged 139% of body weight; medial force averaged 42%.
Phone video can’t measure force—but it can compare the landing around it.
Start free — download SportsTrace now. #Fastpitch
Lower-extremity ground reaction forces in youth windmill softball pitchers — PubMed pubmed.ncbi.nlm.nih.gov/1967…
170 hitters: pros vs youth at contact showed 35° vs 27° back-shoulder abduction, 78° vs 89° back-elbow flexion, and 1,539°/s vs 1,174°/s elbow extension.
Don’t copy a pose. Compare how the back arm gets there.
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Source: Kinematic comparison of baseball batting across competition levels — PubMed pubmed.ncbi.nlm.nih.gov/2727…
23 D1 softball hitters × 3 swings.
Energy flow was relatively low during load + stride, then substantial trunk inflow appeared during acceleration.
Don't compare only the contact frame. Compare the transition into acceleration.
Start free — download SportsTrace now. #Fastpitch
Posting note: Segment power analysis of collegiate softball hitting tandfonline.com/doi/abs/10.1…
100 pitchers: each +1° of lead-knee extension was associated with +0.47 m/s ball velocity (~1.05 mph).
That does NOT mean “straighten the knee = gain 1 mph.”
Compare what the lead leg does from foot contact through release.
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PubMed pubmed.ncbi.nlm.nih.gov/3915…
28 golfers: the higher-handicap group showed 7.1° more lead-wrist radial deviation at impact and a 15.8° difference in shaft angle earlier in the downswing.
Don’t copy one pose. Compare wrist + shaft delivery.
Start free — download SportsTrace now. #GolfSwing #SportsTrace
Differences in wrist mechanics during the golf swing based on golf handicap pubmed.ncbi.nlm.nih.gov/2215…
27 D1 softball pitchers: fastball 56 mph, curveball 55, changeup 42.
Fastball + curveball showed similar upper-extremity loads; changeups had lower shoulder distraction and anterior elbow force.
Different pitch ≠ just different speed.
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Note: Pitch-type biomechanics study — PMC pmc.ncbi.nlm.nih.gov/article…
