Overall Efficiency Grade: 51.075

Force Plate Jumps

Jack has a major unilateral leg bias in his right leg. It’s in a danger zone for likelihood of hamstring pulls. For example, on two of his counter-movement jumps the left leg produced 67% of body weight in the loading phase while the right leg was 109% of body-weight force. The next trial, the left leg was 88% BW and right leg was 131%. The unilateral balance will need to be addressed with strength and conditioning.   Counter movement jumps and squat-pause jumps were nearly equal in rate of force production. The squat-pause jump was 4% more explosive.

Force Plate Swings

Below is video of the swing analysis. I will walk you through this matched up with video.

Despite loading on his toes, Jack creates good back leg loading numbers at 100% of his body weight and holds it well during his forward advance. His back leg torque number is slightly low at 32 Newtons (45 is what I’m looking for) however I don’t believe this is a cause for concern. The forward advance force is a little high. I try to keep the forward advance force under 10% of BW of force and Jack is at 12%. His vertical front leg force is slightly low too at 165% BW, however this is not his preferred option of creating speed. Jack creates a lot of horizontal blocking force and an immense amount of torque force. He uses a cross-body stride style and naturally his back leg has to kick behind him to create torso space to turn to the ball. This is natural and should be encouraged. This style lowers the ROM of his hips and speeds the deceleration rate of his hips (which is seen in the K-Vest data). Front leg torque force was 170 Newtons.

KVEST Sequencing & Rotational Speeds

The 3d readings are on kinematic sequencing and rotational speeds.

Jack has really good accel/decel rates in his hips from the cross body stride style, however he has sequencing errors derived from the failure to complete his upper body load. Because of this, he essentially has a “one-piece” swing where the torso and hips fire at the same time. With his preferred type of speed creation being torque in the lower body, we’d like the upper body to reflect that. Because he doesn’t finish his scap load, he isn’t able to take the slack out of the core and sequence the rest of his body. Leg speeds are “good” at 725 deg/sec, but because of the lack of sequencing, torso speed is in the “needs improvement” category at 876 deg/sec. The lead arm tends to lead the torso and thus has to push forward manually so the angular speeds are low at 870 deg/sec. Wrist speeds are in the same category in the high 1300’s.

Bat Sensor Data

The most important Blast metric is the time to impact (TTI). Jack is in a good range amongst college players at 150 milliseconds. Bat speed was below average at 67 mph and ranged from 66-70 mph.. Rotational acceleration was at 11g’s. This shows the limiting “tightness” of the turn when the sequencing is flawed. I prefer that number at 23-25 g’s. From the illustration below, you can see he maintains posture and his arc, but the lack of rotational acceleration is from the lack of finish of the scap load. Attack angles to the ball was flat at 3-8 degrees.

Summary & Recommendations

• Get with strength and conditioning and monitor the right leg bias which is in a “danger” range.

• Work to tighten the turn by finishing the upper body load (scap load)

• Get the upper body to reflect the lower body torque and increase turns speeds by better sequencing.