蓄力
Also known as: 卷紧, 收拢
蓄力是指在挥棒启动之前，双手和重心向后的小幅聚拢动作——把身体像弹簧一样卷紧，储存弹性能量，在挥棒开始时释放进球中。
蓄力同时服务于两个目的：它把弹性能量储存在躯干、髋部和肩部的肌肉与肌腱中，并把双手安置在一个稳固、可重复的起挥位置，让挥棒能从这个位置高效地启动。一次完整的蓄力，会把重心聚拢到后腿上（蓄力峰值时后脚大约承担60%到65%的体重），前肩略微内转，髋部则顶着前侧的阻力卷紧。这与弹簧被压缩的原理相同：身体向后卷得越远、越充分，向前释放穿过触球点时可用的能量就越多。
蓄力的时机与其力学动作同样重要。蓄力应该从投手的出手提示开始触发——通常是投手双手从固定姿势分开的瞬间，或来自投手扬臂动作的节奏提示。蓄力太晚（在投球已经飞过一半以上距离时才开始向后聚拢）会让打者显得仓促——双手在必须发力之前，永远无法到达完整的起挥位置，触球随之变得又晚又软，通常被推向反方向。蓄力太早（在投手出手之前就开始聚拢）会让卷紧的能量停滞，导致打者在投球到达之前就把重心提前压向前方，形成一次前扑，在触球之前就耗尽了旋转能量。
蓄力还建立起髋肩分离——即挥棒开始时髋部朝向与肩部朝向之间的偏移角度。正确的蓄力会让肩部保持向内卷紧，同时允许髋部开始打开——这种分离正是驱动由下而上旋转力量的张力所在。没有充分蓄力的打者，分离幅度会减小，进而导致髋部旋转变少，迫使手臂额外发力来弥补。大多数打击教练在触碰挥棒路径之前，会先从蓄力环节入手解决时机和力量问题，因为纠正身体蓄力的时机和方式，会向下游传导，改善整个挥棒序列。
Tips by skill level
Think of the load as rocking back gently — no more than a few inches of weight shift onto the back foot — while slightly turning the front shoulder in. It should feel quiet and controlled, not a dramatic weight transfer. The load is preparation, not a swing move.
Match your load trigger to each pitcher's tempo. Against a quick-rhythm pitcher, your trigger cue fires earlier; against a deliberate, slow-delivery pitcher, it fires later. A load that is timed to the pitcher's release rather than a fixed personal rhythm stays consistent regardless of who is on the mound.
Example
随着投手双手分开，打者把60%的体重转移到后腿，前肩略微内转——在蓄力峰值时完全卷紧——随时准备在投球到达时爆发出击。
Why it matters
大多数时机和力量问题都可以追溯到蓄力环节。蓄力太早会导致前扑；蓄力太晚会导致仓促。把蓄力做对，能让整个挥棒序列从正确的起始位置开始运转。
How it shows up on video
From a side-view camera, pause the video at the pitcher's hand break or release. A proper load shows weight visibly shifted to the back foot, the front shoulder slightly closed (rotated inward), and the hands at or near the rear shoulder — set and ready. A late loader shows the weight still balanced or forward at this moment. An early loader shows the front foot already striding forward with the hands already committed.
Common mistakes
- Loading too late — waiting until the pitch is close to the plate before gathering. This leaves the hands in a weak position at the moment the swing must begin.
- Loading too far back, drifting the weight so far toward the back fence that the front foot picks up and the hitter is off-balance before the swing starts.
- Arming the load — pulling the hands back excessively without engaging the torso and hip coil. This produces a load that stores energy in the arms rather than the body.
- Loading on a fixed schedule rather than from a pitcher cue, which causes the timing to break down against pitchers with varying delivery rhythms.
In SwingVantage Motion Lab
Motion Lab reads this phase from pose: when your weight shifts back, how far your shoulders turn, and the hip-shoulder separation you build. It does not see the pitcher, so it cannot tell whether you started on time for the pitch.
Open Baseball in Motion LabFrequently asked questions
蓄力和跨步是一回事吗？
不是——蓄力是双手和重心向后的卷紧动作；跨步是前脚向前的迈步。它们按顺序发生：蓄力先触发，随后跨步在挥棒发力时把重心送向前方。打者可能只跨步不蓄力（形成前扑），也可能只蓄力不跨步（无跨步挥棒），但在一次完整的挥棒中，它们是两个先后发生的独立事件。
我应该对每种球种都做同样的蓄力，还是要针对变速球调整？
蓄力本身对每一种投球都应该保持一致——蓄力是对投手出手节奏的身体反应，而不是对球种的反应。真正针对变速球改变的，是蓄力之后保持重心不前移的能力（维持前侧的耐心），这样双手才不会在一颗较慢的球上提前发力。稳定的蓄力，配合耐心的前侧，是应对球速变化的基础。
Related terms
- 棒速棒速是指触球瞬间棒头的移动速度，以英里每小时计算。它与挥棒路径以及触球发生在棒头的哪个位置一起，共同决定击球初速。
- 髋肩分离髋肩分离是指挥棒过程中髋部与肩部旋转之间的差异。髋部先发力，肩部保持滞后，由此产生储存的扭矩，把球棒甩出。
- 攻角（打击）Attack angle in batting is the vertical angle of the bat path through the hitting zone. A slightly upward attack angle matches the pitch plane for hard contact. Statcast treats 5 to 20 degrees at contact as the ideal range.
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