Amplitude is how far the massage head travels with each stroke. Stall force is how much pressure you can lean into the gun before the motor gives up. One describes depth, the other describes staying power, and a good massage gun needs a sensible balance of both for the way you plan to use it.
If you are over 40 and shopping for a massage gun for stiff shoulders, tired calves or sore hands, these two numbers can look like a race where bigger always wins. It does not. This guide explains what each spec measures, what typical figures look like, and how to pick a comfortable range for your body.
TL;DR
- Amplitude is stroke length in millimeters. A longer stroke reaches deeper but also feels more intense.
- Stall force is the pressure in pounds you can apply before the motor stops. It tells you how well the gun keeps its rhythm when you press in.
- The two work as a pair, so judge them together along with speed, rather than chasing the highest number on either.
- For relaxation and gentle daily use, moderate figures are plenty. Start on the lowest setting and go slowly.
- Avoid joints, bones and the spine, and check with your doctor if you have a medical condition or bone-health concerns.
Table of Contents
- What amplitude actually measures
- What stall force measures
- Amplitude vs stall force: the side-by-side view
- How the two work together
- What typical numbers look like
- Which numbers suit you
- Safety: more power is not more benefit
- Perspective
- Reading a spec sheet in five steps
- Using what you learn: trigger points and warm-ups
- Find your comfort level with Lunix
- FAQ
- Sources
What amplitude actually measures
Amplitude is the distance the shaft travels in and out to meet your body. It is measured in millimeters, and a longer stroke theoretically means a deeper massage. It is not a measure of motor strength or speed.
Think of it like tapping on a door. A short, quick tap and a long, firm knock can both happen at the same pace, but they feel completely different. A short stroke feels like a light, buzzy tap. A long stroke feels like a thump that sinks further into the muscle.
What this means in practice:
- Lower amplitude feels lighter and more surface-level. Many people find it comfortable for the neck, forearms and calves.
- Higher amplitude feels heavier and deeper. It tends to suit large, dense muscle groups such as the glutes and thighs.
- Amplitude alone does not tell you how hard the gun will push back when you press it in. That is the job of stall force.
What stall force measures
Stall force is the amount of pressure you can apply before the motor stops, measured in pounds. Imagine pressing the gun into your thigh harder and harder. At some point the head stops moving. That pressure is the stall point.
A higher stall force means the motor keeps going while you lean in. A lower one means the gun slows or cuts out sooner. If you mostly hold the gun lightly against the muscle and let it glide, you may rarely come near that limit.
How the figure is measured
Manufacturers generally test stall force with a force gauge, pressing against a running device with increasing load. Reporting on test methods notes that results can differ depending on whether the test counts a drop in speed or a full stop. That is why two guns with the same listed number can feel a little different in your hands, and why it helps to treat the figure as a guide rather than an exact promise.
Amplitude vs stall force: the side-by-side view
| Amplitude | Stall force | |
|---|---|---|
| What it measures | Distance the head travels per stroke | Pressure the motor can take before stopping |
| Unit | Millimeters (mm) | Pounds (lbs) |
| What you feel | How deep and heavy each stroke is | Whether the gun keeps its rhythm when you press in |
| Higher number means | Deeper, more intense stroke | More pressure tolerated before slowing or stopping |
| Matters most for | Choosing the depth sensation | Choosing how firmly you plan to press |
The key point: these are complementary specs. Wirecutter lists amplitude as one of three specs alongside percussions per minute and stall force, so no single number tells the whole story.
How the two work together
Here is a simple way to picture it. Amplitude sets how far the hammer swings. Stall force decides whether it keeps swinging when it meets resistance.
- High amplitude, low stall force: a deep stroke in open air that bogs down once you press into the muscle. It can feel jerky and inconsistent on large muscles.
- Low amplitude, high stall force: a gentler stroke that holds steady even when you lean in. It can feel smooth and controlled.
- Balanced amplitude and stall force: a stroke that stays consistent across light and firmer pressure. This is what most people want.
Speed adds a third layer. Fast percussions with a short stroke feel very different from slow percussions with a long stroke. If you want help matching speed to sensation, our guide to massage gun speed settings walks through it.
What typical numbers look like
Spec sheets vary widely, but some rough ranges help. Buyer guides commonly describe budget models with stall force around 20 pounds, and pro-level guns at 60 pounds or more. The same guide suggests amplitude in roughly the 8 to 12 mm range for general relaxation, and around 12 to 16 mm for athletes who want deeper work.
Here is a practical way to read those ranges, using them as rules of thumb rather than medical guidance:
| Your goal | Amplitude to look for | Stall force to look for |
|---|---|---|
| Gentle relaxation, neck, forearms, hands | Lower, around 8 to 10 mm | Lower to moderate, roughly 20 to 30 lbs |
| Everyday soreness, calves, thighs, back | Moderate, around 10 to 12 mm | Moderate, roughly 30 to 40 lbs |
| Large, dense muscles and firmer pressure | Higher, around 12 mm and up | Higher, 40 lbs and up |
Notice that a higher number is not a better number. It is a different feel. A 60-pound stall force is wasted if you only ever rest the gun lightly on your muscle, and a deep stroke can be more than you want on tender areas.
Which numbers suit you
Match the spec to the way you will actually use the gun.
If you want light relaxation
Choose lower to moderate amplitude and a stall force that is comfortable for floating the gun over the muscle. You are not trying to dig. You want a soothing rhythm after a long day at the desk or on your feet. Our routine for desk workers’ hands and forearms is a good example of a light-touch approach.
If you want firmer work on big muscles
A higher stall force helps the gun keep its rhythm as you press into the thighs, glutes or upper back. Moderate to higher amplitude gives you more depth. Even so, let the gun do the work. Pressing harder does not make the session better.
If you have sensitive skin, tender muscles or are new to massage guns
Go for adjustable speeds and a gentler amplitude. A device that lets you start low is more useful than one that only shines at the top of its range.
Safety: more power is not more benefit
Bigger specs mean a more forceful tool, so how you use it matters more than the number on the box. Consumer Reports advises you to start low and go slow, avoid joints, bones and the spine, and talk to a medical provider if you have concerns about whether a massage gun is right for you.
A few habits that keep sessions comfortable:
- Begin on the lowest setting. Increase only if it still feels pleasant.
- Keep the gun moving. Physical therapists quoted by Consumer Reports recommend moving slowly and stopping immediately if pain occurs, because excessive force can lead to injury or tissue damage.
- Use light pressure. A gun with ample stall force does not need you to lean on it.
- Skip bony areas. Stay on muscle, away from joints and the spine. Our neck safety guide explains why the neck deserves extra care.
- Keep sessions short. Our percussion massager safety rules cover timing in detail.
If you are an older adult, take extra care. Physical therapist Dr. Tiffany Shubert has cautioned that massage guns may be too rough for older adults and could lead to a fracture. Talk with your doctor or physical therapist before starting, especially if you have osteoporosis, take blood thinners, or have nerve or circulation conditions.
Deep pressure is also not right for every body. If you are pregnant, ask your clinician before using any percussion tool on your back or hips, and look at round ligament pain stretches for gentler, clinician-vetted options for common pregnancy discomfort.
Perspective
Specs are useful, but they are only half of how a massage tool feels. After a long day, most people are not looking for the hardest hit. They want steady, comfortable relief that they will actually reach for again tomorrow.
That is how we think about recovery at Lunix. We design our products around thoughtful ergonomics, comfort and ease of use, so they fit into your day instead of becoming one more thing to figure out. Our approach starts with how the body feels, not with chasing the biggest number on a spec sheet.
For many of our customers in their 40s, 50s and 60s, the goal is to keep moving comfortably. A balanced tool that you can adjust to a gentle level, combined with short, consistent sessions, tends to serve that goal better than raw force. We build with that reader in mind.
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Reading a spec sheet in five steps
When you are comparing devices, work through this short checklist.
- Find the amplitude. Decide whether you want a lighter or deeper feel.
- Find the stall force. Ask whether it suits how firmly you will press.
- Check the speed range. More adjustable levels give you more control.
- Look at the attachments. Different heads change how concentrated the pressure feels. Our guide to massage gun attachments by body area helps you match them.
- Think about weight and comfort. A device you can hold comfortably for a few minutes gets used more.
If a listing shows only one of the two specs, treat it as incomplete information. You want both numbers to understand how the gun will feel.
Using what you learn: trigger points and warm-ups
Once you know your preferred depth, the technique matters more than the specs. For tight spots, short passes tend to work better than sustained pressure, which is the idea behind our guide to massage guns for trigger points. Before activity, a brief, gentle pass can be part of a routine, as outlined in our massage gun warm-up guide.
Find your comfort level with Lunix
If you are looking for recovery tools that fit into everyday life, explore our body massagers for shoulders, back and larger muscle groups, or our hand massagers if your hands and wrists carry the strain of a busy day. We offer free shipping, and our products are OEKO-Tex certified.
Not sure where to start? Browse the full range at lunixinc.com, where you will also find gift cards and replacement covers.
FAQ
What is stall force on a massage gun?
Stall force is the amount of pressure, in pounds, you can apply before the motor stops. It shows how well the gun keeps its rhythm when you press into a muscle. A higher figure means the motor tolerates more pressure, though you rarely need to press hard.
Is higher amplitude better?
Not necessarily. Higher amplitude means a longer stroke, which feels deeper and more intense. That can suit large muscles, but it may feel like too much on the neck, forearms or tender areas. Choose the depth that feels comfortable to you.
Do I need both high amplitude and high stall force?
No. They answer different questions, and the right mix depends on your goal. For gentle relaxation, moderate figures are enough. For firmer work on large muscles, you may prefer higher numbers, always starting on the lowest setting.
Why do two guns with the same stall force feel different?
Testing methods differ. Some tests record a drop in speed and others a full stop, so the same listed number can mean slightly different things. Amplitude, speed, weight and attachment shape also change how a gun feels.
Are massage guns safe for older adults?
Many people use them gently, but caution matters. Avoid joints, bones and the spine, keep pressure light, and stop if you feel pain. Ask your doctor or physical therapist first if you have bone-density concerns or other health conditions.
Sources
- The 4 Best Massage Guns of 2026, Wirecutter
- Read This Before You Buy a Massage Gun, Consumer Reports
- Best Ways to Stop Muscle Pain, Consumer Reports
- How Stall Force Is Measured on a Percussive Device
- How Powerful Should a Massage Gun Be?