Badminton smash: check your form with your phone
The smash is badminton's finishing shot: hit from above the head, steeply downward and as hard as you can. The power comes from the whole body, the legs, the turn and a fast forearm rotation, not from the arm on its own.
No equipment needed. Practise at home. Just do the swing properly in front of your phone. No court, ball or shuttle is needed, and a racket is optional: the coach judges your movement, so a shadow swing at home in a hallway or garden is enough.
What good looks like
- Turn side-on early and take the racket arm up and back, with your other arm up for balance.
- Reach as high as you can and meet the shuttle slightly in front of your head, arm close to straight.
- Lead with the elbow, then rotate the forearm so the racket face whips through the shuttle.
- Land balanced with the racket back in front of you, ready for the reply.
Common mistakes and how to fix them
Hitting it behind your head
Late contact gives a flat, weak shot. Move your feet back early so the shuttle is in front of you.
Swinging with the arm only
Without the turn and the forearm rotation most of the power is lost. Start the movement from the legs and hips.
Contact too low
If your hand is not clearly above your shoulder at contact, the shuttle goes flat. Reach up.
What Formanti checks on your smash
At the top of the reach, not at the follow-through where the arm is already coming down.
- Reach: hand clearly above your shoulder. an overhead shot is hit up high
- Arm height at the top: 125–180°. Racket arm high overhead, body coiled and uncoiling
- Elbow: 125–175°. Near-straight arm at contact transfers max power
- Elbow lead: elbow up before you swing. lead with the elbow, then throw
- Knee bend: 130–175°. Slight bend = athletic stance, fully extended = post-jump landing
- Speed: against your own other swings. power comes from a quick whip, not a push
Your ready stance
Hold still between swings and the coach talks you into position.
- Knees: 120–165°. Soft, bent knees let you push off in any direction
- Back lean: -5–25° forward. A little forward: not upright, not hunched
- Feet apart: 1–2× shoulder width. Feet wider than your shoulders, for balance
What your report looks like
When you finish, you get a report like this one.
- How many swings were in range, out of how many.
- The one thing to work on next, then the next, each with a drill.
- Every swing as a picture with your skeleton on it: ticked, or flagged with what was off.
What you hear and see when you are off
Hand not high enough
The coach says: “Reach up, hit it at the very top.”
On screen: Reach up: hit it above your head.
Drill: Shadow 10 swings and freeze at the top: your hand should be clearly above your head before you whip down.
Arm too low
The coach says: “Get that arm up a bit higher.”
On screen: Lift your hitting arm a lot higher at the top of the swing.
Drill: Shadow 10 swings in slow motion and freeze at contact: check where your elbow is before you speed up.
Arm too high
The coach says: “Keep that arm a bit lower.”
On screen: Keep your hitting arm a lot lower at the top of the swing.
Drill: Shadow 10 swings in slow motion and freeze at contact: check where your elbow is before you speed up.
Arm too bent
The coach says: “Straighten the arm more. Meet it long.”
On screen: Straighten your arm a lot more through contact.
Drill: Slow shadow swings, pausing at contact: your arm should be almost straight with a soft bend.
Arm locked straight
The coach says: “Keep a little bend in the elbow.”
On screen: Keep a lot more bend in your elbow at contact.
Drill: Slow shadow swings, pausing at contact: keep a soft bend and finish with a wrist snap.
Elbow not leading
The coach says: “Get your elbow up before you swing.”
On screen: Get your elbow up before you swing.
Drill: Without a racket, point your hitting elbow at the sky, hold it a second, then throw your hand up to the top.
A slow swing
The coach says: “Swing through faster. Snap it.”
On screen: Swing through faster.
Drill: Shadow swings with a loose grip and a loud 'whoosh' at the top.
Standing too low
The coach says: “Stand a little taller as you hit.”
On screen: Stand a lot taller on your hitting-side leg at contact.
Drill: Split-step, lunge, then drive up through your front leg as you swing.
Legs too straight
The coach says: “Bend that front knee more.”
On screen: Bend your hitting-side knee a lot more at contact.
Drill: Hold a low ready position for 20 seconds between rallies, then shadow a lunge and freeze on the front knee.
Legs too straight in your stance
The coach says: “Bend your knees”
On screen: Bend your knees.
Drill: Hold a low ready stance for 20 seconds between reps.
Hunched over in your stance
The coach says: “Chest up, don't hunch”
On screen: Chest up, don't hunch.
Drill: Hold the ready stance with your chest proud for 20 seconds.
Drills you can do alone
- Towel whip: hold one end of a towel and shadow a smash. A sharp crack at the top means the arm is whipping, not pushing.
- Freeze drill: shadow a slow smash and stop at contact. Check your hand is high and your elbow is above your shoulder, then repeat at speed.
How to set up your phone
Prop your phone up 2 to 3 metres away with your whole body in view, at about hip height. For the smash, stand side-on to the camera on your hitting side: how far in front you make contact and how big your backswing is can only be judged from the side. It all runs on your phone and nothing is uploaded.
Frequently asked questions
How can I practise the badminton smash at home without a shuttle?
Shadow swings. Do slow swings that freeze at the contact point, then speed them up. A towel helps you feel the whip, and a phone film shows your contact height.
Why is my smash weak?
Usually contact is too low or too late, or only the arm is working. Fix the reach first, then add the turn and the forearm rotation.