The reactive strength index measurement of an athlete's explosiveness by comparing their jump height to the ground contact time in between their jumps. On a scale of 0-5.
Vertical Jump
A measure of any athlete's body strength and reach calculated from the flight time divided by the contact time.
Jackson Urka: 3B/2B, (2025) Kalamazoo Christian, MI. 5-foot-11, 185-pound. (62.2 mph bat speed average). (17.5 mph hand speed average). Began in a tall stance with a slow load, then used a short controlled stride. He found some barrels with some loud contact. Capable while in the infield, recorded position velocities up to 76 mph; shows a natural lengthy exchange, average feet, and developing firm hands.
1/21/23
Jackson Urka: SS/2B, (2025) Kalamazoo Christian, MI. 5-foot-10, 170-pound. (62.1 mph bat speed average). (17.7 mph hand speed average). Begins in an open stance with a smooth slow load, then uses a closed long stride. He found a few barrels with some loud contact. Capable in the infield, his best throw was registered at 70 mph; showed a lengthy exchange, average feet, and firm hands. (Max spin ; Avg ).
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Jackson Urka: 3B/2B, (2025) Kalamazoo Christian, MI. 5-foot-11, 185-pound. (62.2 mph bat speed average). (17.5 mph hand speed average). Began in a tall stance with a slow load, then used a short controlled stride. He found some barrels with some loud contact. Capable while in the infield, recorded position velocities up to 76 mph; shows a natural lengthy exchange, average feet, and developing firm hands.
Jackson Urka: SS/2B, (2025) Kalamazoo Christian, MI. 5-foot-10, 170-pound. (62.1 mph bat speed average). (17.7 mph hand speed average). Begins in an open stance with a smooth slow load, then uses a closed long stride. He found a few barrels with some loud contact. Capable in the infield, his best throw was registered at 70 mph; showed a lengthy exchange, average feet, and firm hands. (Max spin ; Avg ).