How to Throw a Jab: Step by Step for Beginners

Key points

The jab is punch 1, thrown with your lead hand: the left if you stand orthodox, the right if you stand southpaw.
It goes straight out from your chin and comes back the same way.
Your rear hand stays on your chin the whole time.
The jab starts the first combo in Guardia's plan: 1-2, the jab and the cross.

What is a jab in boxing?

A jab is a straight punch with your lead hand, the hand on the side of your front foot. In the boxing numbers it is 1. It is the hand closest to the target, so it gets there first and comes back first.

Boxers use the jab to find their distance, to keep the other person busy, and to start combos. A beginner uses it to learn the basics every other punch needs: punch from your chin, keep the other hand home, and come back the same way.

Which hand throws the jab
Stance	Front foot	Jab hand
Orthodox	Left	Left
Southpaw	Right	Right

How to throw a jab, step by step

Stand in your guard: feet about shoulder-width apart, lead foot forward, knees soft, both fists on your chin, elbows in.
Push your lead fist straight out from your chin. Do not pull it back or drop it first. As the arm straightens, turn the fist so your palm faces the floor.
Keep your rear fist on your chin. Let your lead shoulder rise a little toward your jaw.
Bring the fist straight back to your chin, along the line it went out. Stop just short of a locked elbow.

Common jab mistakes

Jab mistakes and how to fix them
Mistake	What it looks like	Fix
The rear hand drops	Your rear fist leaves your chin as the jab goes out.	Touch your chin with the rear fist on every jab.
The fist loads up	The fist moves back or down before it goes out.	Start every jab from your chin, straight out.
The jab stays out	The arm hangs out, or comes back low.	Bring it back as fast as it went out, to your chin.
The elbow locks	The arm snaps fully straight at the end.	Stop just short of full extension.

Orthodox and southpaw

A southpaw jab is the same punch, mirrored: right foot forward, right hand out, left fist on the chin.

A woman in southpaw guard: right foot forward, both fists at her chin — Guard

The same woman with her right arm straight out at chin height, her left fist on her chin — Jab

Variations

Double jab (1-1). Two jabs in a row. Bring the first one back to your chin before the second goes out.
Jab to the body. Bend your knees to drop your height, then jab at belly height. Keep your back straight.
Jab and cross (1-2). The jab goes out, then the rear hand follows as the jab comes back. See how to throw a cross.

A 2-minute jab drill at home

Set the boxing round timer to one round of 2:00. Face a mirror or your phone, and change the drill every 30 seconds:

Single jabs, slow. Check each step: straight out, palm down, straight back.
Double jabs. The rear fist never leaves your chin.
Jab and cross, 1-2, at an easy pace.
Single jabs again, a little faster, back to the chin each time.

How Guardia sees your jab

Stand 2 to 3 meters from the phone and face it. When you pick your stance in the app, Guardia knows which hand is your lead, so a straight punch from that hand counts as a jab. Guardia follows your whole body and names each jab live, as you throw it. When your rear hand drops, the guard check tells you which hand.

A live round: round 2 of 4 with 0:15 left, a boxer in guard on camera, and the combo 1, 6, 3, 2 below — A live round calling 1, 6, 3, 2. App screen with sample data; the camera view is a stand-in photo.

Safety before you jab

New to exercise, or have a heart, joint, or other health condition? Check with a doctor first. The free PAR-Q+ questionnaire tells you whether you should.
Warm up for 5 to 10 minutes: easy steps, arm circles, slow shadow boxing. A warm-up helps you move better and may lower injury risk.
Clear 2 to 3 meters of floor in front of you. That is also the space the app's camera needs.
Wrap your hands and wear gloves on a bag. In Great Britain's elite team, the hand was injured more than any other part of the body. Shadow boxing needs no gloves.
Stop if you feel chest pain, dizziness, unusual shortness of breath, joint pain that does not settle, or numbness or swelling in a hand.

Jab questions

Is the jab the left hand?

Only if you stand orthodox, with your left foot forward. The jab is always your lead hand, so a southpaw, with the right foot forward, jabs with the right hand.

Should I turn my fist when I jab?

Yes. Turn it so your palm faces the floor as the arm straightens. Start the turn late, near the end of the punch, not as the fist leaves your chin.

Can I learn the jab without a bag?

Yes. Shadow boxing in front of a mirror or the phone teaches the path of the punch, the return, and the guard. A bag adds contact, which needs wraps and gloves.

Sources

Fradkin, Gabbe, and Cameron, 2006. Does warming up prevent injury in sport? The evidence from randomised controlled trials?. Journal of Science and Medicine in Sport.
Loosemore and others, 2015. Boxing injury epidemiology in the Great Britain team: a 5-year surveillance study of medically diagnosed injury incidence and outcome. British Journal of Sports Medicine.
PAR-Q+ Collaboration. The Physical Activity Readiness Questionnaire for Everyone (PAR-Q+). eparmedx.com.