Fitness Device

The Sceptre by FXNL Fitness is a core strengthening device used in both physical therapy and athletic training. For years, crossfit gyms have struggled with sledgehammers and non-adjustable mace products. Sceptre disrupts the fitness mace marketplace with an adjustable length and modular weight system.


Our client from FXNL Fitness came to us with this innovative product design idea. Having been a medical professional focused on the physical therapy needs of patient populations, our customer, an entrepreneur and inventor, provided a wealth of knowledge and research which we used to kick-start the design process.

Most challenging was the creation of differentiating intellectual property strategies while accommodating the desired set of features to meet the needs of the end user.


Design Management

Concept Development

Competitive research and user scenarios informed target specifications.

design culture

Functional Analysis

Once establishing the desired featureset, we confirmed the necessary specifications with a group of professional users.

how to launch a product

Prototyping and Testing

Finally, we built, tested, and refined successive prototypes to test different features and settings.


Creating a prototype
Product design for athlete
Prototype Design
How to sketch a concept
workout products

While the product development process can be customized to apply effectively to the needs of the customer and adapt to changing business objectives, Principal Design's 5 step process is a framework that guides the design team and encourages communication and stable execution.

design process


Principal Design approaches every project methodically. The success of a product development project depends upon the clarity and strength of the process. Organized into the five stages most proven to leverage our design efforts, Principal Design's purpose-driven frameworks were developed and refined to reduce risk while balancing exploration with execution. Our creative strategy is divergent to leverage resources and discovery, and convergent to select for the best opportunities.

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