Where can I wear Muscle Puck?

Muscle Puck is designed to measure surface muscles. Place it over the muscle you want to monitor, with the sensing electrodes aligned along the direction of the muscle. For examples, see our Muscle Placement Guide.

How do I know which direction to place the Puck?

The two upper sensing electrodes should be aligned along the direction of the muscle rather than across it. See the placement illustration above or visit the Muscle Placement Guide for muscle-specific examples.

Do I need to shave body hair?

Usually not. Body hair is generally fine as long as the hydrogel electrodes can make good contact with your skin.

Should I prepare my skin before applying it?

Clean skin works best. Avoid applying the electrode over lotion or oil, and avoid flaky or heavily soiled skin that can interfere with adhesion and contact.

Can I reuse an adhesive electrode?

Yes. Hydrogel electrodes can typically be reused 5-10 times depending on cleanliness and adhesion. Return the electrode to its original liner and Ziploc bag between uses.

Why should I attach the electrode before peeling the liner?

It keeps the adhesive easy to handle and makes it much easier to line up all three snaps. Snap first, then peel and place.

Can I shower or swim while wearing Muscle Puck?

No. Do not shower, swim or submerge the Muscle Puck.

How do I know how much battery is left?

Your Muscle Puck’s battery level is displayed in the Longevity Quantified app. A green LED is visible while charging.

Get Started with Muscle Puck - Longevity Quantified

Set up

Set up your Muscle Puck

Shared by both apps - download the app, attach the electrode, then choose Posture or Power below.

Download the Longevity Quantified app

Download the app and sign in or create your account. When you open the app, it will search for nearby Muscle Pucks. Follow the prompts to connect your Puck. Your battery level is shown in the app.

The Puck

The reusable electronic module houses the core technology and features three muscle-sensor (EMG) electrode snaps that connect to the electrode patch.

The Electrode Patch

A hypoallergenic adhesive patch with three distinct conductive gel zones. It positions the electrodes correctly and keeps them from touching, so every reading stays clean and reliable.

Snap on the Puck

Keep the plastic liner on for now. Align the Puck with the three snaps on the patch and press to snap it securely - a stable mechanical and electrical connection for accurate EMG reading.

Tip: Always snap the Puck onto the patch before peeling off the liner. It's much easier to handle before the adhesive is exposed.

Peel the liner

Remove the backing liner from the electrode patch.

Place it on your body

Position the patch so the conductive zones sit flush against your skin, over any muscle you want to track. Apply gentle pressure for full skin contact.

For the best signal:

Start with clean skin without lotion or oil.
Make sure the hydrogel electrodes are making contact with your skin.
Align the two upper sensing electrodes along the direction of the muscle, not across it.
Body hair is generally fine as long as the electrodes make good skin contact.

Not sure where to place it? View the Muscle Placement Guide →

Read this before you place it

Placement matters

Muscle Puck measures the electrical signal traveling through the muscle. The two upper sensing electrodes should run along the direction of the muscle fibers.

Correct vs incorrect Muscle Puck orientation on the bicep

✕ Incorrect - sensing electrodes turned across the muscle

✓ Correct - sensing electrodes aligned along the muscle

Choose your app

What do you want to do?

Posture

Wear your Muscle Puck on your upper back throughout the day. It monitors both your back angle and your muscle activity and gives you a gentle vibration when you've been in poor posture for too long.

Set up Posture →

Power

Place your Muscle Puck on the muscle you want to measure during exercise. Power combines muscle activity, movement and camera-based pose tracking so you can see how your muscles work while you move.

Set up Power →

Care

Reuse your adhesive electrodes

Your hydrogel electrodes can typically be reused 5-10 times, depending on skin contact and cleanliness.

After use:

Gently remove the electrode from your skin.
Place it back onto its original plastic liner.
Touch the hydrogel with one small drop of water to help maintain moisture and conductivity.
Return it to its Ziploc bag until your next session.

Replace the electrode when it becomes dirty, loses adhesion or no longer makes reliable contact with your skin.

Troubleshooting

Not getting a good muscle signal?

Try these first:

Check placement

Make sure the Puck is positioned over the muscle rather than a bone or joint.

Check orientation

The two sensing electrodes should run along the direction of the muscle.

Check skin contact

All electrodes need good contact with your skin.

Check the hydrogel

If you're reusing an electrode, make sure it still adheres well and hasn't become excessively dirty or dry.

Try a clear contraction

Contract the target muscle deliberately and see whether Power detects the activation. A slow bicep curl is an easy way to test your setup.

Still having trouble? Contact Support

Regulatory

FCC ID: 2BW7RLQ101

This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Class B Digital Device Notice

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.

The FCC requires the user to be notified that any changes or modifications made to this device that are not expressly approved by Longevity Quantified may void the user's authority to operate the equipment.

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. The device has been evaluated to meet general RF exposure requirements. The device can be used in portable exposure conditions without restriction.