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Additional Information

Competing Interests

Martin Daumer has invented the "free heel running pad" and he is an Academic Editor for PeerJ. None of the other authors has possiby competing interests.

Author Contributions

Martin Daumer conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Michael Trost conceived and designed the experiments, performed the experiments, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Paul Subkowski conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, prepared figures and/or tables, reviewed drafts of the paper.

Christian Lederer conceived and designed the experiments, performed the experiments, analyzed the data, wrote the paper, reviewed drafts of the paper.

Funding

There was no external funding.


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