A script to download workouts and exercise alternatives. Prerequisites are GNU Parallel, cURL, and jq.

download_workouts.sh

#!/bin/bash

USERNAME=d@t.com
PASSWORD=r

LANGUAGES="en fr it ja tr es pt de"
PATHS="v3/coach/workouts v2/coach/workouts v2/coach/exercise_alternatives"

echo "Logging in"
export ID_TOKEN=`curl --silent -X POST -H 'Content-Type: application/json' -H 'Accept: application/json' -d '{
  "login": {
    "email": "d@t.com",
    "password": "r"
  }
}' 'https://api.freeletics.com/user/v1/auth/password/login' | jq -r .auth.id_token`

doit() {
  HEADERS_FILE=`mktemp`
  export OUTPUT_FILE=$1-`echo $2 | tr / -`.json
  
  curl --silent "https://api.freeletics.com/$2?include_deprecated=true" -H "Accept-Language: $1" -H "Authorization: Bearer $ID_TOKEN" -H 'Accept: application/json' -H 'User-Agent: Edward' -D $HEADERS_FILE > $OUTPUT_FILE  
  
  export ETAG=`awk '/^ETag: / { print $2 }' $HEADERS_FILE | tr -d ' \t\n\r\f'`
  jq -n '{ (env.OUTPUT_FILE): env.ETAG }'
  rm -f $HEADERS_FILE
}
export -f doit

echo "Fetching workouts"
ETAGS=`parallel --files doit ::: $LANGUAGES ::: $PATHS`
cat $ETAGS | jq -s add > workouts.json