A pure R FIT file decoder. After having a package pulled from CRAN due to licensing issues with the FIT SDK, the only way to bring that package back from the dead was to put this together. As far as I'm concerned, it is fit for purpose, but I am aware it is not a complete implementation. If this does not meet your needs in its current state, feel free to submit a patch.
Anyhow, performance is suprisingly good, and the package is written to have no external dependencies. I hope you find it useful!