Why you hit the ball late in tennis, and how to fix it
Meet it in front. Fix your timing with your feet.
See it, eight instants at a time.
Every frame is traced from real match footage, so you see the shape of the stroke, not a drawing of an idea.
Move the idea yourself.
One instrument from The Program, free here. Drag it and watch the numbers change: models are labelled as models.
A drawn model of the dwell (Brody, Cross & Lindsey): compression, the mains sliding and snapping back, the ball leaving faster and spinning. Your brain needs about 200 ms to change anything, so every correction happens before the ball arrives: in your feet.
Key facts
- ~5ms
The ITF describes a typical ball–string impact lasting about 5 ms.
ITF, Strings, November 2019
- ~4.17ms
At 240 fps, consecutive frames are about 4.17 ms apart. Exposure and frame timing also limit the detail.
- 03
Ball compression and string deflection both store energy; some is dissipated during rebound.
Lindsey, Tennis Warehouse University, 2021
- 04
Contact position alone does not determine face angle, acceleration or where the shot lands.
Why it works
Both ball and string bed deform. Their stiffnesses and energy losses affect the rebound. A fixed-frame model omits racquet recoil and is not a measured forehand.
For a comfortable-height ball, use the area in front of the hip as a coaching reference. Compare like-for-like balls; height, grip and intended shot matter.
If footage shows crowded contact after a late arrival, test earlier preparation and adjustment steps. Film another comparable set. A long miss alone does not prove that footwork caused it.
The line to say on court“Space first, then swing.”
Drill: Hit and freeze
15 min · alone or with a partner- Hit ten drop-fed forehands and finish each stroke normally. Pause the side-view recording near contact to inspect the ball relative to the hip.
- Take twenty fed balls to alternating depths. Adjust with small steps; review every fifth stroke on video.
- Film ten comparable rally forehands from the same side view. Mark the contact frame and count contacts in front of the hip; count ambiguous frames separately.
More drills like this: forehand, practise alone, beginners
Faults and fixes
Questions players ask
How long is the ball on the strings?
Roughly 5 ms in the ITF description of a typical impact; the exact duration varies.
Why are my forehands going long?
A long miss alone does not identify its cause. Inspect face angle, swing path, spacing and the incoming ball.
Where should I make contact?
For a comfortable-height forehand, in front of the hip is a useful coaching reference. Adapt to your grip, ball height and intended shot.
What this doesn't cover
The impact model uses illustrative stiffness and damping values, a fixed frame and a one-dimensional collision. It excludes spin, friction and frame recoil and awaits physics review. Its energy account is checked numerically, but it is not calibrated to equipment. Source footage does not resolve the full collision.