Intermediate
后侧塌陷
Also known as: 后膝塌陷, 挥棒“坐下”
Definition
后侧塌陷是指在挥棒过程中,后膝和后髋向下、向内塌陷,而不是保持叠放到位并进行旋转,这会流失旋转力量,并让挥棒平面变得不可预测地降低。
稳固的后侧就像挥棒围绕旋转的支柱——随着髋部转动,后膝应该大致保持在后脚正上方,而不是向下塌陷、向前腿方向内扣。当后侧塌陷时,整个身体在挥棒过程中的高度都会下降,这既会流失旋转能量,也会让球棒接近球的角度在每一次挥棒之间变得不一致。
Example
后膝在挥棒过程中向内塌陷并下沉,而不是保持稳固并旋转,击球员的棒头路径因此变得比预期更陡、更不稳定。
How it shows up on video
A collapsing back side shows the back knee dropping in height and rolling inward toward the front leg during the swing, rather than staying at a consistent height and rotating around a stable base.
Common mistakes
- Trying to generate power by sitting down into the swing rather than rotating around a firm back leg
- Weak or fatigued lower-body strength allowing the back knee to cave under rotational load
- Overstriding, which puts the back leg in a weaker position to resist collapse during rotation
In SwingVantage Motion Lab
SwingVantage tracks back-knee height and lateral position through the swing, flagging a collapse pattern that correlates with uneven bat-path angle at contact.
Related terms
Related guides & benchmarks
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