Beginner

ストライド(打撃)

Also known as: ストライドステップ, 着地, 前足の接地

Definition

ストライドとは、打者がタイミングを取るために踏み出す小さな一歩、またはつま先タップのことだ。これはパワーの源ではなくタイミングの機構であり、柔らかく方向性のあるものでなければならない。

良いストライドは短く(4〜8インチ)、柔らかく(足が着地する際に体重移動がほとんどない)、方向性がある(投手方向、あるいはやや内側を狙う)。ストライドは股関節を発動させ、股関節は手を発動させる。硬く長いストライドは体重を前に移しすぎ、球を見極める前に打者を先にコミットさせてしまう。ノーストライド(つま先タップやレッグキック)は、可動部分を減らしながら同じタイミング機能を果たす。ストライドのタイミング、つまり投手の腕が前に出てくるのに合わせて着地することが、オンタイムの打者と遅れる打者を分ける主要な変数だ。

Beginner tip

Practice a "soft step" stride by focusing on keeping your stride foot's weight as light as possible when it lands — if you can't pull it back quickly after landing, your stride is too hard and is committing your weight forward.

Advanced note

Film your stride foot direction from directly overhead on a batting practice session and measure the angle between your stride path and the pitcher's mound — any drift toward home plate is immediately visible from this angle and should be corrected with a toe-closed stride cue before other mechanical work.

Example

彼はストライドを8インチから4インチに短くし、体重をより長く後ろに残せるようになった結果、変化球へのカバー範囲がすぐに改善した。

Why it matters

Whether you are early, on time or late is the most fundamental diagnosis in hitting, and your stride is where it starts. Motion Lab reads your stride from pose, but it does not see the pitcher, so judge the timing against the release on video.

How it shows up on video

On video, stride quality is assessed by measuring the foot-landing position relative to the starting foot position and the direction of the stride foot relative to the pitcher's mound. Common errors include a stride that drifts toward home plate (opening the front hip prematurely), a stride that is too long and hard (producing forward weight transfer that collapses the back-side load), and a stride that lands too early in the pitch cycle (committing the hitter before the pitch's speed and movement are readable).

Common mistakes

Striding toward home plate rather than the pitcher, which opens the front hip prematurely and causes early upper-body rotation before the pitch is identifiable
Using a hard. This drives stride that transfers 60%+ of body weight forward. This leaves the hitter committed and front-weighted before they have read the pitch type or speed
Striding too early in the pitch cycle — landing while the pitcher's arm is still in the windup — which forces the hitter to hold a static ready position for too long and sacrifices the dynamic timing advantage the stride is designed to provide
Abandoning the stride entirely in response to early timing problems without replacing it with an equivalent timing mechanism (toe-tap or leg-kick). This leaves the hitter without any pre-swing timing trigger and produces reactive, arm-only swings

In SwingVantage Motion Lab

Motion Lab reads your stride from pose: its length, its direction and when your front foot lands in your swing. It does not see the pitcher, so it cannot time your stride against the release.

Open Baseball in Motion Lab