蹬地——投球
Also known as: 蹬离投手板, 腿部驱动
蹬地是轴心脚顶着投手板发力的初始动作，把腿部力量转化为身体向前的动能，是风车式投球动作开始时的第一步。
快投垒球的球速更多来自下半身驱动和核心旋转，而不仅仅是臂力。强劲的蹬地会让髋部先朝本垒板方向启动，在手臂完成整个圆弧动作之前就为动力链加载能量。较弱的蹬地会迫使投手单靠手臂发力，这会损失球速，并增加受伤风险。蹬地必须保持合法——脚的拖行是允许的，但重新落地（跳步犯规）则不允许。
Think of the push-off as throwing your hips at the plate first. This means if your hips arrive before your arm, your lower body is doing its job correctly.
Film your push-off from a side angle and measure your stride length reliably. Increasing stride length through better drive mechanics adds velocity without additional arm effort.
Example
投手用力蹬离投手板，髋部率先启动，这股动能贯穿整个风车动作，产生了合法范围内的最大球速。
How it shows up on video
Look for the hips leading the arm circle by a clear frame. This means the hip arrives at the plate-facing position before the arm releases, confirming proper kinetic chain sequencing. A pitcher with a weak push-off will show the arm and hips arriving nearly at the same time, indicating an arm-dominated delivery. The stride length will also be noticeably shorter on pitches with poor push-off drive.
Common mistakes
- Pushing off the side of the rubber rather than the front face, angling force laterally instead of toward the plate
- Initiating the arm circle before the leg drive begins, disconnecting the lower body power from the delivery
- Using a stiff knee on the push-off leg rather than loading it first, reducing the available drive force
- Focusing so much on not crow-hopping that the push-off becomes timid and the foot barely moves forward
In SwingVantage Motion Lab
Motion Lab measures hip linear velocity at push-off and tracks the kinetic chain sequencing from foot drive through hip rotation to confirm that leg power is successfully transferred into the pitch.
Frequently asked questions
为什么蹬地对球速而言比臂速更重要？
因为蹬地驱动着整条动力链；强劲的蹬地会成倍放大手腕甩动瞬间可用的力量，而单靠臂速产生的球速要小得多。
我怎么判断自己的蹬地力度是否足够？
强劲的蹬地表现为一步长而有控制的跨步，髋部在手臂释放球之前，就已经明显到达面向本垒板的位置。
Related terms
Related guides & benchmarks
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