About Us

Prüfengel offers authentic consumer tests in which real users share their experiences with products. Our tests are based on practical applications in everyday life and reflect the opinions of consumers. As we focus on consumer tests, we do not carry out material, long-term or laboratory tests. Our aim is to provide honest feedback to help you make a purchasing decision. For a detailed insight into our comprehensive evaluation process, which forms the basis of all our product reviews, please click here.

Body & Mind®
Royal feather

The Königsfeder from Body & Mind® is a bendable, flexible spring dumbbell. The Königsfeder is one of the fitness classics.
The Königsfeder is a timeless bodybuilding classic and is one of the most effective and reliable training tools for strength training.
It is perfect for building muscle mass.
The king spring trains the entire upper body.
The Königsfeder is an ideal option for anyone who wants to be flexible with their training. It offers comprehensive fitness support and flexible training times and locations, as the Königsfeder is easy to transport. The Königsfeder from Body & Mind®impresses with its high-quality workmanship and performance.

Advantages

✅ Holistic fitness support
✅ Flexible intensity
✅ Robust
Trains the entire upper body

Disadvantages

❌ None

The test

General information

We took a close look at and tested the product in a practical test. In the following, we take a closer look at the features and impressions. From the packaging, materials and quality to the range of functions and handling, the product is subjected to our test procedure.
To give you a quick overview, we work with a points system. The maximum achievable score per area is 100 points. The final overall score is calculated from the average of all tested features, taking into account the respective weighting. For a detailed insight into our comprehensive evaluation process, which forms the basis of all our product ratings, please click here.

The first impression

Packaging and contents

ℹ️ Here we take a closer look at packaging. Sustainability is becoming an increasingly important factor. In addition, adequate protection of the product must of course also be guaranteed. Are the contents of the packaging complete and does the manufacturer make it as easy as possible for me to use the product straight away?

CriterionRemarkScore achieved*
Product protectionCardboard ensures high stability and offers sufficient protection for the product.100 points
Sustainability PackagingNo unnecessary packaging waste was produced100 points
Package contents & scope1 royal feather100 points
Instructions for useProduct self-explanatory100 points
Total100 points
Weighting: 20%
*The maximum score is 100 points

The packaging of the Königsfeder from Body & Mind® is sturdy and protects the product adequately from damage during transportation. The Prüfengel Institute recognizes the exemplary sustainability of the packaging, as there is no unnecessary packaging material or plastic. The contents of the packaging are carefully compiled and complete. Instructions for use are not required because the product is self-explanatory.

The first time in your hand

Product processing and appearance

ℹ️ Before we start the practical test, we take a close look at the workmanship of the products. How high quality are the materials used? Are the look and feel satisfactory?

CriterionRemarkScore achieved*
Visual appearanceAttractive design100 points
ProcessingVery good quality of workmanship100 points
StabilityExtremely robust100 points
Sustainability of the productNo information on sustainability, but high-quality materials80 points
Total95 points
Weighting: 20%
*The maximum score is 100 points
The mainspring is ready for the practical test.

The King Feather from Body & Mind® impresses with its simple and attractive appearance and is 57 cm long. The Königsfeder is a timeless bodybuilder classic. The workmanship is excellent, there are no visible defects or unclean transitions. Thanks to the extra strong resistance, a training effect of approx. 30 kg (beginners and lightly trained) or 50 kg (advanced and professional) resistance is achieved. The width is 42 mm and the king spring has two ergonomic handles to ensure a secure grip. The flex dumbbell is also equipped with nylon safety loops. The product offers excellent stability and the material gives a robust impression. Although there is no explicit information on the sustainability of the product, the high-quality workmanship and quality indicate a certain longevity.

This is what our practical test showed

Does the manufacturer keep its advertising promises?

ℹ️ Our practical test has the highest relevance and therefore weighting. Here, the product has to undergo a wide range of criteria and tests. We check the functions and product promises of the test article.

CriterionRemarkScore achieved*
MobilityCan be taken along at any time100 points
Functionality and slip resistanceMultifunctional
Non-slip thanks to the ergonomic handles
100 points
Variants30 kg and 50 kg100 points
IntensityFlexible100 points
Training effectTrains the muscles of the upper body. High training effectiveness100 points
Total100 points
Weighting: 45%
*The maximum score is 100 points

The Königsfeder from Body & Mind® convinced us in our practical test with its high functionality. It is an effective and reliable training device for strength training.
The flexible intensity is another advantage. The high-quality dumbbell is available in 30 kg and 50 kg and uses a carbon steel spring to provide a force that adapts to the individual effort required to achieve maximum results. This feature is particularly important for building muscle mass. The king spring trains the entire upper body.
The flexible bending dumbbells isolate and train the entire upper body, i.e. arms, neck and shoulders, triceps, biceps and chest muscles. This speaks for the good quality of the material and the careful workmanship.
The training effectiveness of the Königsfeder is excellent. The Königsfeder can be tested for 30 days without obligation. If you are not satisfied, you can return the bending barbell and get your money back immediately. The flexible resistance tones the upper body. The training is long-lasting and profound. The resistance changes depending on how much the dumbbell is bent, allowing a wide variety of exercises to be performed.
The inner deep muscles are also strengthened and built up. The flexible resistance minimizes the risk of injury.
In the practical test, the quality of the Body & Mind® king spring finally convinced us. The mobility, functionality, slip resistance, variations, intensity and training effect make the Königsfeder a recommended choice for every fitness enthusiast.

Price/performance ratio

and ratings from consumers

ℹ️ Finally, we examine how the product compares to the competition. Can it keep up with the competition in terms of price and quality? Would we generally recommend buying it? We also look at the consumer reviews and check whether the critical and positive reviews are actually justified.

CriterionRemarkScore achieved*
Price / performance ratioGood performance in the lower price segment90 points
Rating cut4.2 out of 5.0 on Amazon60 points
Total75 points
Weighting: 15%
*The maximum score is 100 points

On the Amazon platform, consumers rate the product with an average of 4.2 stars. One common complaint is that the smell of the dumbbell is unpleasant. Many customers like the fact that the training is effective. In our practical test, we were able to confirm that the training effect was good and that the unpleasant smell was slightly noticeable.

Prices of up to €34 are charged on the Internet for equivalent products. Very inexpensive products are available from as little as €16 . With a price of €16.95, the Königsfeder from Body & Mind® is therefore currently in the lower price segment. For the quality and performance received, the price-performance ratio is good.

Overall result

WeightingScore achieved*
1. packaging & contents20%100 points
2. product processing & appearance20%95 points
3. in the practical test45%100 points
4. price/performance & consumer ratings15%75 points
Total95 points
*The maximum score is 100 points

The Body & Mind® brand Königsfeder was awarded an overall score of 1.3 and thus successfully qualified for our test seal. The test was carried out in the test period 09/23 and is stored in our database under the license number 230810032. Further information on our test procedure can be found at www.pruefengel.de/testverfahren.

Test result:

1,3

Royal feather
of the brand
Body & Mind®
achieved
95
Points in our test and therefore passed. The test was carried out in the test period
09/23
and is stored in our database under the licence number
230810032
. Further information on our test procedure can be found at www.pruefengel.de/testverfahren.

The practical tests are based on careful observations and do not include long-term or laboratory tests. The test judgements reflect the personal impressions and opinions of the testers who try out the products in everyday use. We would like to emphasise that these evaluations do not claim to be exhaustive and may reflect both subjective and objective impressions. The evaluations are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a serious and thorough testing procedure, which has been developed in a long and professional process in close co-operation with our testers.

The practical tests are based on careful observation and do not include long-term or laboratory tests. The test ratings reflect the opinion of our experts and are based on careful analysis. We would like to emphasize that these evaluations do not claim to be exhaustive and reflect both subjective and objective impressions. The assessments are made to the best of our knowledge and belief, without any liability being assumed for the accuracy or completeness of the test results. It is important to note that our tests are not based on legal requirements, medical effects or specific ingredients of the products. We rely on the advertising claims and information provided by the manufacturers, but use of the information is always at your own risk. Our efforts are aimed at ensuring a reputable and thorough testing process, which has been developed in a long and professional process in close cooperation with our experts.

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Evaluation process

You can find a detailed insight into our evaluation process, which forms the basis for our product ratings, here:

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