Extremely simple converter for converting the trainings list of a freeletics export YAML to CSV for further processing.
On the freeletics.com website one can export the data that freeletics has
stored about the user.
Currently, clicking the export button will forward to a customer support
request form, where the export needs to be requested.
After a day one will receive a link to a file called fl_uid_XXXXXX_at_NNNNNN,
which is a compressed archive containing a text_data.yml.
Extract the data export archive, place text_data.yml next to convert.py and
then call python convert.py from that directory. The result will be a
training.csv. That's it.