Off-speed
Change-up
The slow pitch off a fast look, built on the timing gap.
MovementReputable analysisLast checked June 7, 2026Open question: none on file
The change-up subtracts speed while the arm keeps fastball tempo, so the hitter commits early and the ball arrives late. Fastpitch has a whole shelf of ways to make it — the flip, the turnover or backhand, the circle, the knuckle change — each killing speed a different way off the same windmill.
Grip, spin, movement
Several recipes: a flip change off the back of the hand, a turnover/backhand change, a circle (OK) grip, or a knuckle change — all keeping the arm circle while taking speed off.
Low spin and reduced speed; the deception is sameness of arm action, not movement.
Arrives well under fastball speed; the gap, not the break, is the pitch.
The physics
The change-up keeps the windmill look while arriving later than the fastball. That extra flight time is the pitch: the hitter starts the swing against the familiar arm circle, then the ball reaches the plate after the expected window.
The job
The timing-wrecker off the same arm circle as the fastball.
Every line above is one click from its source. Still to come for the circle: the full grip geometry and a 12″ seam, the way the baseball wing files a pitch.