workouts.py

import json
import re

with open("AARON1.DAT", "r") as f:
    workoutfile = f.read().strip()

workouts_json = "[" + workoutfile.replace("    }\n}\n{", "},\n{").replace("}\n{", "},\n{").strip()[0:-1] + "]"

try:
    workouts = json.loads(workouts_json)
except json.decoder.JSONDecodeError as e:
    print("Failed to parse line %i" % e.lineno)
    print("\n".join(workouts_json.splitlines()[e.lineno-1:e.lineno+2]).encode("unicode_escape").decode("ascii"))

from pprint import pprint
user_data = workouts.pop(0)
pprint(workouts)