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.
Grayson Loos: RHP/3B, (2025) Frontier Regional High School, MA. 6-foot, 160-pound lean athletic build. Above average advanced at the plate, the left-handed hitter clocked an exit velocity of 84 mph. (68.8 mph bat speed average). (21.6 mph hand speed average). Started in a wide balanced stance with a tight compact load, then used a controlled stride. Bat speed was quick, had a level loose swing plane and good extension on his front foot finish. He barreled up multiple balls with tons of loud contact. Pull side approach. Projectable in the infield, his best throw was registered at 77 mph; had soft hands, athletic footwork, and a clean exchange. Fielded the ball out front with athletic movement laterally. Showed a ¾ slot and a loose arm action with consistent accuracy to the base. Projectable on the mound, used a loose arm action and a high ¾ arm angle while showing good arm speed. Tall-and-fall type pitcher who shows easy effort. Showed strong balance point with downhill shoulders. Lands closed with balanced finish. Slider (72-73 mph). Sat with his fastball at 76-79 mph; had sinking action and arm side control with heavy movement. (Max spin 1908; Avg 1830). Showed a 1/7 curveball (66-67) with slurvey action. (Max spin 1943; Avg 1807). Showed arm side command and fading action on his changeup.
Exit Velocity: 84 mph
Arm Velocity: 77 mph
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Grayson Loos: RHP/3B, (2025) Frontier Regional High School, MA. 6-foot, 160-pound lean athletic build. Above average advanced at the plate, the left-handed hitter clocked an exit velocity of 84 mph. (68.8 mph bat speed average). (21.6 mph hand speed average). Started in a wide balanced stance with a tight compact load, then used a controlled stride. Bat speed was quick, had a level loose swing plane and good extension on his front foot finish. He barreled up multiple balls with tons of loud contact. Pull side approach. Projectable in the infield, his best throw was registered at 77 mph; had soft hands, athletic footwork, and a clean exchange. Fielded the ball out front with athletic movement laterally. Showed a ¾ slot and a loose arm action with consistent accuracy to the base. Projectable on the mound, used a loose arm action and a high ¾ arm angle while showing good arm speed. Tall-and-fall type pitcher who shows easy effort. Showed strong balance point with downhill shoulders. Lands closed with balanced finish. Slider (72-73 mph). Sat with his fastball at 76-79 mph; had sinking action and arm side control with heavy movement. (Max spin 1908; Avg 1830). Showed a 1/7 curveball (66-67) with slurvey action. (Max spin 1943; Avg 1807). Showed arm side command and fading action on his changeup.
Exit Velocity: 84 mph
Arm Velocity: 77 mph