Core Swagger Review – The Key To Core Power In Tennis

What Is The Core Swagger RSD?

The Core Swagger is a device that is worn like a belt, and the best position for it is low around the pelvis. It gives you vibrating feedback when you engage your core correctly throughout the play.

Unlike negative feedback tools, this device rewards correct movement rather than penalizing incorrect actions, motivating players to activate their core. It rewards you for movements between shots, executing a proper split step, or rotating the hips during groundstrokes.

Key Features

• Biofeedback via Vibration: When worn correctly, the device vibrates in response to dynamic and proper core activation with rewarding signals that motivate continued improvement.
• Adjustable Strap: Simple and easy to put on, designed to be worn low around the pelvis, allowing athletes an effortless attempt to feel the connection between core movement and body control.
• Easy Activation: One simple button activates and deactivates the device. A test split-step or jump confirms it’s working.
• Positive Reinforcement: Instead of punishment and a negative approach, this device buzzes only when the player moves correctly, encouraging active, engaged posture and technique.

How It Works In Practice

Since most of the readers of FeelTennis.net website are adult recreational tennis players as well as coaches and parents of young competitive tennis players, I pointed out three situations that apply directly to you.

1. Encourages Movements Between Shots

Players who tend to freeze after hitting are prompted to stay active because the Core Swagger device encourages movement between shots. 

If the player doesn't move, the Core Swagger will not vibrate as it does not detect enough core activation.

But as the player is encouraged by their coach or they realize themselves that they should actively move between shots, the Core Swagger device will activate and reward that type of movement.

2. Reinforces Split Step Timing

One of the most overlooked elements of good footwork is the split step—an essential movement that should occur just before your opponent makes contact with the ball.

The Core Swagger device provides instant biofeedback (a buzz or vibration) when you execute a proper split step.

This helps reinforce correct timing and reminds players—especially at the recreational level—that consistent split stepping is a key habit for playing more responsive, high-level tennis.

3. Enhances Pelvic / Hip Rotation

Efficient stroke production begins with strong engagement of the hips and pelvis. The Core Swagger device activates when it detects dynamic pelvic rotation, giving players real-time feedback that they're using their core effectively.

While some foundational coaching may be necessary to understand how to rotate the pelvis properly during groundstrokes, once players begin to incorporate that movement correctly, the device rewards them with clear feedback—helping build better habits and more powerful, balanced strokes.

And lastly, as you saw Neil demonstrate in the video above, this device also supports pre-match warmups with hops, lateral shuffles, and rotation drills as it constantly gives players positive feedback when their movements are dynamic and stable.

What It's Not

The Core Swagger does not teach tennis techniques and skills. It is up to the player to exercise and practice drills to perfect his game.

A player could still use poor form and activate the device if the movement is dynamic enough.

For example, you can activate the vibration on the device if you put your leg down fast and hard, if you move too aggressively, or rotate your body too much while moving.

But its strength lies in reinforcing physical engagement, not correcting stroke mechanics.

Pros:

• Reinforces good habits without coach intervention
• Encourages dynamic, athletic movement
• Positive reinforcement makes training more enjoyable
• Especially helpful for players who struggle with footwork or body coordination
• Useful for both warmups and on-court drills
• Includes free biomechanics training course

Cons:

• Doesn’t correct poor stroke mechanics by itself
• May require coach guidance initially to set up and use effectively
• Version 2 is still a couple of years away (solo development)

Pricing & Availability

• Discounted Pre-Order: €249 (down from €299) with free worldwide shipping for FeelTennis subscribers.
• Affiliate Disclosure: Tomaz earns a small commission on purchases made through his link, but this does not influence the objectivity of the review.

Final Verdict

The Core Swagger RSD is a smart, innovative tool that addresses a real gap in athletic training, especially for adult tennis players who struggle with staying engaged during points.

It doesn't correct bad technique nor take the place of coaching, but it does what it says it will, and that is it raises awareness and reinforces appropriate core activation, which is the cornerstone of all athletic movement with a positive outlook.

I highly recommend it for recreational players, coaches, and trainers seeking a hands-on tool to improve movement quality and core engagement in sports.