Intermediate

Speed Bag

The speed bag is less about power and more about keeping your hands up and moving in a steady rhythm, which quickly taxes shoulder endurance as the arms stay elevated and cycle for whole rounds. The repeated small strikes train timing and coordination between the two hands. It is a classic finisher that builds the muscular endurance boxers need to hold a high guard late in a fight.

Equipment
Heavy Bag
Body part
Shoulder
Type
Cardio, Functional
Muscles worked
Target
Deltoid Anterior, Deltoid Middle
Secondary
Deltoid Posterior, Brachioradialis, Extensors
Tertiary
Triceps Brachii Lateral Head

How to do it

  1. 1

    Set the bag platform to about eye level and stand square beneath it.

  2. 2

    Raise both fists near the bag with elbows up and forearms roughly parallel to the floor.

  3. 3

    Strike the bag with the side of a loose fist in a small circular motion.

  4. 4

    Let the bag rebound three times, then strike with the other hand in the same rhythm.

  5. 5

    Keep a steady, even tempo rather than trying to hit hard.

  6. 6

    Work timed rounds, keeping the elbows high throughout.

Tips

  • Keep the elbows lifted; letting them drop breaks the rhythm and rests the wrong muscles.
  • Use a relaxed, loose fist and small motions to sustain speed over a full round.
  • Start slow and only build tempo once the three-count rebound feels automatic.

Variations

Common mistakes

  • A platform left at the last person's height puts the bag above your reach or below your elbows, and no rhythm survives that; set the board so the bag hangs near your eye level before you throw a punch.
  • The bag gets hit hard because it looks like a punching drill, and one heavy strike knocks it out of rhythm for the rest of the round.
  • Wrists fold on contact because the wrist goes limp along with the relaxed hand, so the side of the hand meets the bag at an angle; keep the wrist straight and swing from the whole forearm.
  • One hand does most of the work while the other only taps, which makes the rhythm limp; count rebounds out loud for a round to even the two sides out.
  • Shoulders shrug up toward the ears to hold the elbows high, and the neck takes the strain for three minutes; lift from the upper arm and let the shoulders sit down.

Frequently asked

How long should you work the speed bag when you are new to the exercise?
Start with three rounds of one minute and rest as long as you need, because the shoulders will call time long before your lungs do. Spend the first sessions on single-hand rhythm: strike, count three rebounds, strike again with the same hand, and bring the second hand in only when that never breaks. Build toward three-minute rounds over a few weeks. Tempo is the last thing to add, not the first, and a slow round that never stops beats a fast one that does.
What can I use instead of a speed bag?
A double-end bag trains timing too, though it teaches range rather than rhythm. Without any bag, hold the same elbows-up position and roll your fists around each other in small circles for a round; it is a different skill, but it builds the shoulder endurance the bag demands. A tennis ball on elastic tied to a doorframe gives you a moving target for accuracy. Nothing truly replaces the rebound rhythm, so if that is what you want, a bag and platform is the purchase to make.
What is the speed bag actually good for?
It builds shoulder endurance and hand rhythm, and it trains you to keep your hands up and busy when your arms want to drop, which is why it has survived in boxing gyms. It does not build punching power, and the motion is nothing like a jab, so it teaches no punch you would throw at a person. Skip it while a shoulder is painful overhead, since a round holds the arms elevated the entire time, and do not count it as a substitute for bag work or running.

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