Fastball–Changeup Mirror
Throw the fastball and changeup to the same called window, then compare whether both pitches execute the shared plan.
Foundation
Pitch Development · Pairing
Level
L2
Length
24
Pitches
Fastball, Changeup
Goal: Execute 12 FB–CH sequences to the same called window and compare execution by pitch type, location, and delivery.
WARMUP
Before the first pitch.
Complete a proper throwing warm-up before scoring pitches. Use full-body movement, progressive catch play, and enough mound-ramp-up pitches for the listed pitch types and delivery modes to feel ready.
Warm-up throws are not included in the workout score, but they still count toward the pitcher’s total throwing workload for the day.
Block 1
Middle-Down Mirror
Windup — Repeat sequence 2x
- FB — Middle-Down
- CH — Middle-Down
Stretch — Repeat sequence 2x
- FB — Middle-Down
- CH — Middle-Down
Block 2
Glove-Side Down Mirror
Windup — Repeat sequence 2x
- FB — Glove-Side Down
- CH — Glove-Side Down
Stretch — Repeat sequence 2x
- FB — Glove-Side Down
- CH — Glove-Side Down
Block 3
Arm-Side Down Mirror
Windup — Repeat sequence 2x
- FB — Arm-Side Down
- CH — Arm-Side Down
Stretch — Repeat sequence 2x
- FB — Arm-Side Down
- CH — Arm-Side Down
Target Definitions and Sequence Rules
- Middle-Down: The broad lower-middle portion of the established strike window.
- Glove-Side Down: The lower glove-side portion of the established strike window.
- Arm-Side Down: The lower arm-side portion of the established strike window.
- Mirror: Both pitches use the same called target and delivery. They are not expected to follow the same flight or produce identical movement.
- Sequence Order: Throw FB first and CH second in every sequence.
If either pitch misses, record the pitch-specific MISS marker and complete the sequence to the original shared target. Do not chase the miss or add a makeup pitch.
24 tracked pitches: 12 sequences, 12 FB, and 12 CH.
Development or preseason: 1–2 times per week with about 48 hours between structured mound sessions.
In season: 0–1 development bullpen per week. A game appearance or other meaningful mound session replaces it.
Track This Session
Choose Bullpen Session. Name it Fastball–Changeup Mirror — [Pitcher]. Create 4 markers.
Delivery tracking: Enable Windup and Stretch. Both pitches in a sequence use the same assigned delivery.
+
FB SPOT
Fastball finishes within its assigned target.
+
FB MISS
Fastball finishes outside its assigned target.
+
CH SPOT
Changeup finishes within its assigned target.
+
CH MISS
Changeup finishes outside its assigned target.
Coaching Focus
- Establish one shared target before each sequence.
- Keep delivery tempo, intent, and arm speed committed for both pitches.
- Do not force the changeup to move like the fastball.
- Judge each pitch against the shared target, not against the other pitch’s movement.
- Complete the sequence before making an adjustment.
RESULTS
Score the Session
Count successful sequences out of 12. A sequence succeeds when both pitches receive SPOT; compare FB and CH execution within each shared target.
9–12 successful sequences
Great
Both pitch types repeatedly executed the same called windows. Confirm which shared target produced the strongest mirror.
7–8 successful sequences
Competitive
The pair was usable, but one pitch type, target, or delivery created a clear drop-off.
0–6 successful sequences
Keep Working
The fastball and changeup did not execute the shared plan consistently. Widen one target and rebuild the pair.