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PR TIMES: https://prtimes.jp/main/html/rd/p/000000013.000139200.html

Finger training goes from “strength” to “structure”. “Pocket Ninja,” the latest tool inheriting European design philosophy, draws renewed attention

Published Apr 5, 2026 5:00 PM ・ Updated Jun 1, 2026 2:57 PM ・ 10 min read ・ Source: PR TIMES

The “Pocket Ninja” is a new, portable finger training tool that builds on the design philosophy of the “Boulderball”. It emphasizes consistent, injury-free training over raw strength, with a compact design (7cm, 140g) that fits Japanese hands and allows for precise movements. Developed by Ebertallee Co., Ltd. and designed by Martin Oberhauser, it incorporates sports science theories from Dieter Kofler to promote natural acquisition of correct finger usage and is currently available for pre-sale on Makuake at a special discount.

Not strength, but how to use it.

As a new product that inherits the development philosophy of the climbing training tool “Boulderball”, Ebertallee Co., Ltd. (Headquarters: Kyoto Prefecture) is currently

pre-selling “Pocket Ninja,” a pocket-sized, portable finger-specific training tool, on the crowdfunding service Makuake.

The planned general retail price is 7,980 yen (tax included), and it is currently available at a special price, more affordable than the general retail price, exclusively on Makuake.

(https://www.makuake.com/project/pocketninja/)

Background: Towards an era where “continuation” is more important than “strength”

“What can be continued” changes results more than “strength”.

In climbing, “strength” has traditionally been emphasized.

However, currently,

・Risk of finger injury ・Inability to continue training ・Decreased performance due to overload

Such issues have become apparent, and

the era is shifting to one where “how long can you continue without breaking” is emphasized, rather than “how strong can you become”.

“Sister Model” inheriting Boulderball's philosophy

Left: Pocket Ninja / Right: Boulderball

Pocket Ninja was developed based on the philosophy of the “Boulderball” training tool, which received design recognition in Europe,

・more compact ・easier to incorporate into daily life ・focuses on more precise movements

as a sister model.

Size design that fits Japanese hands

Size design that fits Japanese hands | Compact design of 7cm・140g

With conventional training tools,

・Too large in size ・Does not fit the range of motion of fingers ・Difficult to reproduce subtle movements

Such issues existed.

Pocket Ninja, with its compact design of approx. 7cm and 140g,

・Easy to hold in Japanese hands ・Can reproduce delicate finger movements ・Can be controlled without applying excessive load

achieves such a structure.

This design was born from feedback saying “too big and difficult to use.”

Design philosophy evaluated by global standards

Behind the development of Pocket Ninja is global design recognition.

The previous work “Boulderball” receivedthe international design awardA’ Design Award (Italy).

This product, developed in its wake, was also designed by Italian product designerMartin Oberhauser.

It lies in “the fusion of function and design.” Furthermore, this product has been featured in overseas design media,

introducing its perfection as a product and the uniqueness of its design philosophy.

See the article here: https://designradiant.com/171597

The philosophy of “undamaged fingers” based on sports science

Not strength, but refining “how to use”.

The development of this product reflects the theories ofDieter Kofler, a Master of Sports Science and a climber.

In climbing, what is important is the idea that:

・“How to use” rather than muscle strength ・“Control” rather than strengthening ・“Balance” rather than load

Pocket Ninja, with its structure that “naturally acquires correct movements”,

enables efficient training while suppressing excessive strain on the fingers.

Difference from Boulderball | Evolution to “pocket size”

Serious finger training that fits in your pocket.

Pocket Ninja is a model that inherits the philosophy of Boulderball whileexpanding its use to everyday life.

・Boulderball: Overall movements such as gripping and supporting ・Pocket Ninja: Finger precision, control, and judgment

There is a difference in that it is designed as “training that can be done anywhere.”

Support from climbers

Reasons why actual climbers choose it.

From actual users, comments such as:

“I thought it was too small at first, but it's completely different once you use it.” “Even for a short time, I can really focus on my fingers.”

have been received.

In particular, it has gained support as a tool that meets needs such as:

・Cannot continue finger training ・There are days when I can't go to the gym ・Want to get in shape quickly

A new training of “getting in shape while playing”

Training is within play.

The greatest feature of Pocket Ninja is its “getting in shape while playing” design.

Addressing the challenges of conventional training such as:

・Tough ・Cannot continue ・Seems like it would cause injury

Its design, which makes you naturally pick it up, transforms training from a habit into an “experience.”

Project Page

This project aims to promote it in Japan,

offering it at a special limited-time price (up to 41% OFF) before general sale.

Both quantity and period are limited, soplease take this opportunity to experience it.

Pocket Ninja is currentlypre-selling on Makuake.

👉 https://www.makuake.com/project/pocketninja/

FACT BOX

Source: PR TIMES
Category: product_launch