The field manual
The craft underneath the pitch.
The craft
Wing 01 · The delivery
Mechanics
The pitch is built in the legs and trunk, then handed to the arm. Sequence and timing transfer the force; a break in the chain makes the shoulder and elbow pay for it.
The craft
Pitch Design
How a pitch gets built: read the current shape, find the arsenal gap, change one grip cue, and validate against hitters.
How pitches work together
Sequencing & Tunneling
How to make different pitches look alike early, split late, and change a hitter’s timing across the whole count.
The craft
Spin & Shape
Spin axis gives the pitch its first direction. Seam position and release feel decide whether that direction shows up cleanly.
The craft
Reading Models
Modern pitch models are useful scouting language, not the grip itself. Read them as context, then return to shape, feel, and intent.
Pitch design trends
State of the Craft
The sweeper became a named mainstream shape, the kick-change spread through coaching video, the sinker became more tactical, and the screwball remains a broken teaching lineage.
The matchup
Handedness
How pitch direction changes when the batter’s hand changes: away, into, arm-side, glove-side, and neutral vertical shapes.
Wing 10 · The lineage
The Canon
Curated reading path spanning classic pitching philosophy, biomechanics, psychology, and modern analytical frameworks—solutions, not idols.
Health & development
The modifiable risks
Arm Health & Workload
Rising UCL injury epidemic driven by overuse and fatigue; evidence-based prevention through workload limits, rest, and monitoring
The pathway
Youth Development
Age-appropriate progression from fastball through change-up, pitch count limits by age, and the injury risks of early specialization.