Jackson Sigman
@GetSiggyWithIt_
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Joined December 2011
Free Agent RHP Seeking Affiliate, Indy, or Int'l opportunity 2025 by the numbers FPS: 83% (19/23) WR2K: 74% (14/19) CSW%: 35% (36/102) Avg. EV: 83.2 MPH Whiff%: 39% (18/46) SwStk%: 18% (18/102) In Zone%: 48% (49/102) Built up for 3+ IP, 55+ pitches
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Back Leg Aesthetics ≠ Velocity @GetSiggyWithIt_ breaks down biomechanics data from over 8,000 pitchers and asks: Have we been looking at the back leg all wrong? 🤔
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Year 3 of working with @Kaminsky21 The best, and only way to attack player development is to develop relationships that allow you to build multi year plans, chipping away and reiterating as we go. Excited to dial this one in with @GetSiggyWithIt_
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Thanks for having me out!
Little light work today with Free Agent RHP @GetSiggyWithIt_ Great to have you in Jackson - dude can spin it!
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Congrats to @BlakeGoldsberry on his dominant 2025 season with @kscitymonarchs! After starting the year as a lights out reliever with a fastball reaching as high as 97 MPH, Blake seamlessly stepped into a starter role with the club and didn't skip a beat the rest of the way.
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This is undoubtedly the coolest update to our IZT and just in time for the pro offseason👀 Struggling to put hitters away in 2k counts? Now, we can display these put away heatmaps on the target and clearly project where pitchers can generate whiffs and freezes for the kill🗡️
🎯Command Training at @DrivelineBB 🎯 Need to train command this off-season? Watch @sayhomies - former #Rockies farmhand and current Driveline Ops Coordinator - throw a short session on the patent-pending Intended Zone Tracker w/ Projector, now with Heatmaps!
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Long overdue 🫡 see you boys soon
Full Circle: in 2020 @GetSiggyWithIt_ spent countless hours on zoom talking me through my delivery as I trained remotely with @DrivelineBB. Five years later we finally meet in person, and have shared an office the last few weeks. Cool person. Great Mentor.
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What an outing for Blake Goldsberry! 6.1 IP | 6 H | 0 R | 0 ER | 1 BB | 7 SO | 26 BF Steffon Moore comes in to finish off the 7th inning. #LongLiveTheFun | #LetsGoMonarchs
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Cleaning up arm actions >>> cleaning up the facility... pro offseason right around the corner😌
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tl;dr - the ability to flex, abduct, and internally rotate the rear hip is good for generating ball velocity, as well as linear and rotational speeds Focus on improving these functions before getting caught up in the aesthetics of your back leg
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We have known what rotates the pelvis for quite some time Before you go buy some snake oil, it might be a good idea to dominate the basics https://t.co/jvRTn6QGS2
And maybe that's another part of the sequence that we need to properly account for. The front hip externally rotates > the back hip interally rotates > the pelvis rotates.
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Why does pelvis rotational velocity matter? The ability to rotate the pelvis fast is a strong predictor of the ability to rotate the torso fast, something that is highly important for ball velocity
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However, throwing is not solely linear - there is a high degree of rotation involed Do any of the hip metrics help us rotate the pelvis? Hip flexion shows up near the top of the rankings, which makes sense More flexion -> more extension More extension -> better rotation
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I combined some of the hip metrics to see if any combination of them did a better job predicting COG Velo than each standalone feature - hip abduction by itself does quite a good job!
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The ability to move fast down the mound is important for creating ball velocity, but what creates that speed? It appears the ability to abduct the hip is good for COG Velo, with the ability to flex the hip following not too far behind!
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When looking directly at explaing ball velocity, we see that the amount of rear hip internal rotation cracks the T25 Pitch Velocity Predictors*, coming in at 14 But what about flexion and abduction? Lets look at COG Velo and Pelvis Rotation Velo *biomechanical markers only
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I added the following metrics to our "Points of Interest" database 🔘max_rear_hip_angle_x (flex/extension) 🔘max_rear_hip_angle_y (ab/adduction) 🔘max_rear_hip_angle_z (int/external rotation) Let's see if our database backs up the above charts👀
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The athlete drives a bit deeper into internal rotation before "pushing out" or extending into foot plant This push accelerates the COM speed to peak at landing, before using the lead leg block to convert linear speed into rotational speed
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Now that the athlete has finished dropping, it is time to redirect energy towards the target This is the point where the athlete begins exchanging hip flexion for abduction, converting vertical COM speed into speed horizontally
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After "Lift," it is time to "Drop" As the athlete comes out of leg lift, the rear hip flexes and moves into deeper internal rotation while the center of mass drops This move stores kinetic energy, commonly referred to as loading
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As a pitcher moves into the "Lift" phase of the delivery, the pelvis coils around the rear femur This move puts the rear hip in slight internal rotation, creating some "tension" https://t.co/Zu8oKVreaJ
Similar to the lead femur, the rear femur also operates as a fixed point for the pelvis to rotate against in leg lift This move puts the rear hip in internal rotation and shifts the COM forward creating momentum down the mound
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