Skip to main content

자동 번역입니다. 영어 버전이 기준이며, 표현은 점차 다듬어 나갈 예정입니다. 개선할 부분을 발견하셨나요? 알려주세요.

Advanced

백사이드 메커닉

Also known as: 백사이드 드라이브, 트레일사이드 메커닉, 뒷힙 드라이브

Definition

백사이드 메커닉은 뒷힙, 뒷무릎, 뒷발이 스윙에서 어떻게 작동하는지를 말한다 — 지면에서부터 배럴까지 회전력을 만들어내는 '엔진' 쪽이다.

앞쪽이 안정을 잡는 동안 뒤쪽은 힘을 만들어낸다: 뒷힙이 앞으로 돌아 나가고, 뒷무릎이 안쪽으로 회전하며 투수 쪽을 향하고, 뒤꿈치는 앞꿈치로 굴러 넘어간다. 뒤쪽이 소극적인 경우(힙이 뒤에 남고 무릎이 밀리지 않고 그냥 흘러가는 경우)는 가장 간과되기 쉬운 파워 손실 원인 중 하나다. 최상급 슬로피치 타자는 앞쪽만큼 뒷힙도 적극적으로 사용해 온몸으로 배럴을 존 안에서 가속시키는 '핀치' 동작을 만든다.

Beginner tip

Feel your back elbow drive forward close to your hip like you are elbowing someone behind you. This means this activates the back hip and keeps the elbow from flying away from the body.

Advanced note

Use a medicine ball rotational throw drill. This means stand sideways to a wall, load on the back side, and explosively rotate to throw the ball into the wall. This means this trains the back-hip firing pattern that transfers directly into bat speed.

Example

타격 코치가 '뒷힙을 밀어붙여라'라고 지시하자 타자의 타구 속도가 시속 6마일 상승했다 — 뒷힙이 뒤에서 끌려오는 대신 임팩트를 향해 능동적으로 발화했기 때문이다.

How it shows up on video

The back side is visible on video from a face-on angle as the trail side of the body. This means the back shoulder, back hip, and back foot. A proper back-side role shows the trail elbow staying close to the body through the early downswing and the back hip firing aggressively through contact before clearing. A passive back side shows the trail elbow flying out early (casting) and the back hip lagging behind or failing to clear. This causes an arm-dominant swing with limited power.

Common mistakes

  • Dropping the back shoulder at the start of the swing to try to get under the ball. This tilts the swing plane steeply and produces a high pop-up rather than a level line drive
  • Allowing the back elbow to fly away from the body early in the downswing. This causes the bat to take a longer arc path that wastes the rotational energy the back side was building
  • Spinning the back hip open too early in the load phase, which eliminates the hip-shoulder separation that the back side is responsible for creating
  • Staying passive on the back side and relying entirely on the front side to generate power. This produces a soft arm swing without the hip-drive that makes the back side powerful

In SwingVantage Motion Lab

SwingVantage tracks the trail elbow path and back hip firing timing from uploaded swing video, identifying dropped back shoulder and early elbow casting as separate back-side fault categories.

Still have a question about 백사이드 메커닉? Ask SwingVantage

Related guides & benchmarks

Put this into your swing

SwingVantage can spot this in your own swing — free to start.

See a sample Slow-Pitch Softball report first