#! /usr/bin/env python3

import json
from pprint import pprint

my_input = r"""{
    "hasMore": false,
    "checkins": [
        {
            "timestamp": 1353193745000,
            "timezone_id": "{"name":"America/Denver","seconds":"-21600"}",
            "privacy_groups": [
                "private"
            ],
            "meta": {
                "client_version": "3.0",
                "uuid": "fake_UUID"
            },
            "client_id": "fake_client_id",
            "workout_name": "Workout (Nov 17, 2012)",
            "fitness_workout_json": {
                "exercise_logs": [
                    {
                        "timestamp": 1353195716000,
                        "type": "exercise_log",
                        "timezone_id": "{"name":"America/Denver","seconds":"-21600"}",
                        "workout_log_uuid": "fake_UUID"
                    },
                    {
                        "timestamp": 1353195340000,
                        "type": "exercise_log",
                        "timezone_id": "{"name":"America/Denver","seconds":"-21600"}",
                        "workout_log_uuid": "fake_UUID"
                    }
                ]
            },
            "workout_uuid": ""
        },
        {
            "timestamp": 1354485615000,
            "user_id": "fake_ID",
            "timezone_id": "{"name":"America/Denver","seconds":"-21600"}",
            "privacy_groups": [
                "private"
            ],
            "meta": {
                "uuid": "fake_UUID"
            },
            "created": 1372023457376,
            "workout_name": "Workout (Dec 02, 2012)",
            "fitness_workout_json": {
                "exercise_logs": [
                    {
                        "timestamp": 1354485615000,
                        "timezone_id": "{"name":"America/Denver","seconds":"-21600"}",
                        "workout_log_uuid": "fake_UUID"
                    },
                    {
                        "timestamp": 1354485584000,
                        "timezone_id": "{"name":"America/Denver","seconds":"-21600"}",
                        "workout_log_uuid": "fake_UUID"
                    }
                ]
            },
            "workout_uuid": ""
        }]}"""

def recurse(obj):
    if isinstance(obj, list):
        for item in obj:
            return recurse(item)
    if isinstance(obj, dict):
        for k, v in obj.items():
            if isinstance(v, str):
                try:
                    v = json.loads(v)
                except ValueError:
                    pass
                obj.update({k: v})
            elif isinstance(v, (dict, list)):
                return recurse(v)

pprint(json.loads(my_input, object_hook=recurse))