• From The App Store, download TheStack App (iOS) and login with your Apple ID.
• Enter the Serial Number (the 5 digit code) found by unscrewing the threaded stem of your Stack hardware.

That’s it!  Fill out the Profile information, and follow the prompts in the App to do your Baseline Session and select a Program to get started.  If you still have any problems, contact us here.

First, you'll need to activate your account following these steps:

• Download and login to TheStack App (iOS)
• Follow the prompts to Activate Coaches License
• Key in your Subscription Number, which can be found on your order confirmation e-mail
  
• You're all set and ready to add players to your stable

If you already have a profile and have been using the App, log out of the App first, then follow these steps listed above.

Click Here to watch a comprehensive video overview for how to use your Coaches License

Still having problems? Contact us here.

There are 2 options to add family members who want to train with TheStack hardware.

Option 1: You can add a family member to train on their own iOS device, just as you are. To do that, simply have that family member download the App and activate the same serial number you did. This will in no way impact your training data, and we allow a serial number to be activated several times for this purpose.

https://www.thestacksystem.com/apps/help-center#hc-i-have-thestack-hardware-how-do-i-get-started-training

Option 2: You can add them as 'Local Golfers' - on your iOS device, under your Apple ID login. To do that, here are the steps:

1) Click Profile (top right corner)

2) Click the Address Book (top right corner)

3) Click the '+' (top right corner)

4) Click 'Add a Local Profile'

Your serial number is located on the threaded stem of your Stack hardware.

Here is a full video overview of connecting to the Mevo Plus with TheStack App (iOS):

https://www.thestacksystem.com/pages/flightscope-mevo-connectivity

Below are some quick tips on how best to use the Mevo Plus with The Stack System.

1.  Decide on an “impact” area.  Where the weighted end of TheStack will pass closest to the ground.
2.  Place the Mevo Plus on the ground approximately 5 feet behind the designated impact area and pointing down the target line. This is the direction you would be trying to hit the ball, if there was one present.
3. Turn on the power and give the unit a few seconds to boot up.
4. Launch TheStack App and follow the steps to complete your workout.
5. You will arrive at a screen that allows you to Select and Connect to the Mevo Plus.
6. If Mevo Plus is not set as your radar, then simply tap the radar that is shown and toggle to Mevo Plus.  Once Mevo Plus is shown, hit Connect.
7. The next screen guides you through connecting to the radar.  Ideally you will have already connected your device’s Wi-Fi to the Mevo Plus before this session and you will see that at the top of the screen.  If you are connected to a different Wi-Fi, then tapping on that Wi-Fi source will take you to Settings on your device where you can connect to the Mevo Plus.
8. Once connected, hit the Back button in the top left of the screen to return to TheStack app.
9. Connect the Stack app to the Mevo Plus by hitting Connect.
10. The radar’s tilt number will be shown and if outside the targeted tilt range simply manually adjust the radar until a check mark appears and hit Continue.

Please watch this helpful video

SC200 Plus Set-Up

We have seen the best success with placing the PRGR 2.5' - 3' behind the low point of your swing with TheStack as shown below.

The club setting you choose (i.e. W1, U3, etc.) should not matter for Stack speed measurements - this only factors into PRGR's distance and smash factor calculations during a ball impact.

You have 2-years of access included with your Stack hardware purchase.  After that, yearly access is $99/year and can be managed in the App Store.

Apple only allow us to provide one free year of the subscription at a time.  So, if you purchased during a time when 2-year access was included, the first year will be delivered to you through a Free Trial and the second year of included access will be delivered via a code in the App at exactly 365 days from your start date. 

Subscriptions on Apple will renew automatically unless you unsubscribe. If you no longer want the subscription for any app, you can cancel directly from the App Store at any time. Please cancel the subscription a minimum of 24 hours before the renewal date.   

For more assistance, please see Apple’s help page here: https://support.apple.com/en-us/HT202039 

Important: Uninstalling an app will not automatically stop your subscription. You must cancel your subscription to end the subscription. If you uninstall the app without canceling your subscription, you will still be charged.   

• Open Settings on your Apple device 

• Tap on your Apple ID/email address 

• Tap “Subscriptions"  

• Tap on the app to manage your subscription.  

For more asssistance on managing subscriptions, please see Apple’s help page here: https://support.apple.com/en-us/HT202039 

• Make sure the device is freshly logged in with the Apple ID that made the original purchase. 

• Tap on the "Restore Purchases" button, found on the bottom of the Settings page. 

When you cancel your subscription renewal, you maintain full access to the app until the current subscription period ends. As soon as the current subscription period ends, your status will update to "not subscribed" and you will have limited access to the app's content.  

The Coaches License product is purchased directly from www.thestacksystem.com and managed outside of the Apple Subscription. If you have any questions regarding upgrading, downgrading, or unsubscribing from your Coaches License, send us an e-mail to info@thestacksystem.com  

For all kids 10-14, we recommend TheStack Junior.  For kids 15+, use the fitting chart below, because we factor in their current driver length into the recommendation: 

If your child is under 13 years old, they must train as a Local Golfer under their parent or guardians profile in TheStack App.

Yes, measuring your speed and dynamically adjusting your Stack Weights during your training is fundamental to The Stack System.  We work with a variety of options which you can read about here.

For now, TheStack App is only available on iOS, and requires using a device that is compatible with iOS/iPadOS 15.0 or later.  A complete list of options can be found here:

https://support.apple.com/guide/iphone/supported-models-iphe3fa5df43/15.0/ios/15.0

If you are anxious to get started now, you can use TheStack App on an iPad - the large display makes for a great training experience - or acquire an older iPhone. 

Lost a weight?  No problem, reach out to us on our contact page and let us know what you need.  We'll work out details with you to send a replacement.

Yes, you can change the grip on your Stack hardware without drastically changing the weight properties that are key to training - because the large weight changes are occurring at the distal end of the hardware.

Whether you are re-gripping it yourself or using a 3rd party repair shop, please ensure to take extra care as with any club not to over tighten or over-clamp the shaft during the re-gripping process, as over-clamping of the shaft can lead to damage.

First, make sure you are comparing apples to apples

• Please compare eSpeed to your driver speed when not hitting a ball. This would be the case in the Baseline driver swings. Prior to speed training it is common for clubhead speed to be much slower without ball contact.
• Please ensure you are comparing speeds measured with the same radar.  For example, the radar you use for Stack training may read differently from a radar you used during a recent club fitting session.

• You are actually swinging your driver differently than TheStack.
• Your driver length is not the same as what you’ve entered in your Profile information.
• The radar is picking up your driver speed slightly differently due to its material make-up and shape. 
• TheStack and driver are not moving through the same location in space relative to the radar. Since TheStack is shorter, you will need to stand a bit closer to the target line. 
• Clubhead speed is a function of linear grip speed and angular grip speed. If you have high linear grip speed relative to angular grip speed, then your eSpeed will tend to be over estimated. Watch this video for details  Influence of Driver Length on Clubhead Speed

Yes. An adult can meaningfully increase clubhead speed while training with a Junior length Stack. 

If your driver length is 42" or shorter, then a Junior length will work best. The main consideration is the length of your driver.  The Stack System is primarily concerned with increasing your clubhead speed with your driver. As such, we want to provide overload and overspeed stimuli relative to your driver. 

If your driver length is  between 42" and 44", then either length Stack will be equally effective.  

If your driver length is greater than 44", we recommend using an Adult length Stack. This is regardless of your age, height, or swing speed.

The Junior length Stack is ~3" shorter than the Adult version, which makes it a viable option for folks training in a confined space with lower ceilings.

Please make sure you correctly complete the Profile information section in the app.  The algorithms for the Junior length stack are meaningfully different from the Adult version to ensure that correct overspeed and overload conditions are met. 

Prior to Stack training, it is typical for golfers to swing meaningfully slower when making swings without a ball being present.  Some golfers initially swing up to 20% slower, when making air swings. This is despite no difference in perceived effort.

This gradually changes with Stack training. Eventually most Stackers will have faster swings when not hitting a golf ball. 

Impact with the golf ball takes approximately 25% of the speed out of the clubhead.  It takes some unconscious learning for golfers to reach maximum clubhead speed and then absorb this extra 25% when making air swings.  Learning to quickly activate and deactivate your muscles is a benefit of Stack training. Watch this video for a deeper dive on some of these concepts and to understand why we don't include opposite side swings in our training protocols.

Why No Non-dominant Swings with TheStack

If this does not apply to you, then some other possibilities are:

• Low batteries on your radar
• Your radar location is not correct.  Please read the instructions that came with your radar.

Coordinating Stack training with other types of physical conditioning

Many Stackers have gained perspective after watching the following video.

Speed Increase Expectations

Just follow the app's recommendation. The app will know how long it has been since your last training session and will suggest modified programming if necessary. 

This will be by the way of Return to Form workouts.  These workouts have reduced volume and intensity.  The data from these workouts will be saved as a separate graph that can be viewed by swiping from right-to-left in the app.You are not able to "pause" the program to prevent your Grit Score from dropping.  By design, the app's algorithms don't care why you haven't followed the program. 

Special Sessions are separate from your regular Stack workouts and serve several purposes.  They also count towards your Grit Score.

Speed Priming without Balls: These sessions take approximately 8 minutes to complete and serve as an excellent pre-round boost to your swing speed.  They can act as a replacement to hitting balls after your dynamic warm-up if the course has no range.  They can also be inserted after you've hit irons on the range, but before you transition to driver. These sessions are also an excellent way to bridge the gap between regular workouts if you find yourself short on time. Professional golfers will often perform these sessions on Thursday or Friday, following their round during tournament weeks. 

Speed Priming with Balls: These sessions are similar to Speed Priming without Balls; however, there is an additional set that calls for hitting drivers with ball contact.   These sessions are an excellent way to track your clubhead speed progress in a more realistic scenario.  These can be completed every few weeks on off days, or in the place of a regular training session. 

Return to Form: These sessions are primarily designed to ease Stackers back into training after an extended break. The app monitors the time since your last workout and will automatically recommend these workouts.  In this scenario, you do not need to access these workouts through the Special Session button as the app will call up the workout for you.  However, golfers may choose to perform these workouts without an app recommendation.  Perhaps you had a particularly strenuous weightlifting session the day before and are looking for a less strenuous speed training session to keep the momentum going.  

All things equal, Step Intent swings should generate higher speeds than regular Max Intent swings.

However, Step Intent swings are more challenging to execute with proper mechanics. As such, it is common for Step Intent swings to initially be slower until proper mechanics are achieved. Even though your speed may be slower, it is worth challenging yourself to execute the proper coordination. There are two benefits:1. Learning mechanics that are more advantageous for clubhead speed.

2. Once learned, the added speed will enhance the training stimulus. 

If timed correctly, Step Intent swings will increase the contribution from the ground reaction force under the lead foot. This will add more angular momentum into the system.  More angular momentum in the system gives more potential to increase clubhead speed if this momentum can make it from the body out to the club. You should be stepping forward as the your backswing is still being completed, which will help add a stretch in the torso and lead shoulder muscles. It will also help to focus on maximizing wrist lag in these swings. 

Yes!

Clubhead speed is the single best predictor of a golfer's score. 

The Stack System works great for beginning golfers. It allows you to focus on the mechanics of increasing clubhead speed, without the continual negative feedback of making poor contact with the golf ball.

Here's a video that explains a bit more about The Stack System.

https://www.thestacksystem.com/pages/how-the-stack-system-works

Dr. Sasho MacKenzie discusses the biomechanics of using over load and over speed training with TheStack for increasing clubhead speed in this video. 

Biomechanics of Training Clubhead Speed

Dr. Sasho MacKenzie discusses the neuromechanics behind training for clubhead speed in this video.

The Neuromechanics of Increasing Clubhead Speed