This looks awesome - Ive just used the prompt to build an 8 week ftp plan - I wonder what feedback this gpt gives me for each work out
I tried using ChatGPT (and 2 others) to suggest what days I should do weights if I was running on specific days. All 3 gave the same answer, with good reasoning.
So far so good, so I asked ChatGPT to plan the weights workouts within some specific parameters. This looked really good and organised, aligning with a lot of what I know already. That is until I sat down and looked in detail at the exercises and found it had suggested a Plank with Band Pull Apart that I’ve never heard of.
So I asked for more details
That had me scratching my head, because it didn’t seem physically possible. You’d end up balancing all your weight on your legs only while in a plank position? I queried this, and it was rather defensive and took several goes before it sort of admitted it was wrong. Maybe it’s learning from the non-apology culture out there:
It also made some a basic mistake on another exercise. Given that it’s just trying to predict what character to write next you can see how it gets it wrong, writing inside rather than outside on an exercise, because the previous word is often followed by either of them.
So my learning is it can have some interesting ideas, but you’ve got to be careful about blindly following it’s advice. Its worth having a bit of an understanding in the first place
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I’m creating my new ATP with AI for next outdoor season and I had something similar (I don’t remember with which LLM) happened to me. AI suggested me a “dead bug” exercise that I’ve never hear so I asked more informations and the response was not the real exercise I found on youtube.
What I really like about new version of AI (DeepSeek and the “think before” of ChatGPT) are the “reasoning” models. it’s interesting to read and see how it “think” before the reply and help to spot something strange.
this should be printed in big font in all AI homepages…
Except ChatGPT, has anyone tried other AI models for running training plans? Just wondering if ChatGPT is the “best one” 
This is a great tool - thanks! I’ve created a training plan and saved it as a JSON format but I’m struggling to find how to import the training plan into my Intervals.icu library. Could you possibly help instruct me how?
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Interested about the same. I’d like to use GPT to create a macro cycle of running workouts for example a block of 3 weeks and then import it into Intervals. If someone could make a short video to go through the steps this would be helpful.
to send the “AI plan” to your calendar:
- make sure the json is correct, I had to ask AI to fix it a couple of times.
sould be an array similar to this:
[
{
"start_date_local": "2025-03-04T09:00:00",
"category": "WORKOUT",
"type": "Ride",
"name": "Sweet Spot Intervals",
"description": "Warmup\n- 10m 50%-65% 90rpm\n\nMain Set\n- 3x 12m 88%-92% 85rpm\n- 5m Z2 85rpm\n\nCooldown\n- 10m 50%-40% 80rpm"
},
{
"start_date_local": "2025-03-07T09:00:00",
"category": "WORKOUT",
"type": "Ride",
"name": "Recovery Spin",
"description": "Warmup\n- 10m ramp 50%-65% 85rpm\n\nMain Set\n- 45m Z1-Z2 90rpm\n\nCooldown\n- 10m 50%-40% 80rpm"
},
{
"start_date_local": "2025-03-09T09:00:00",
"category": "WORKOUT",
"type": "Ride",
"name": "Endurance Ride",
"description": "Warmup\n- 10m ramp 50%-70% 85rpm\n\nMain Set\n- 1.5h Z2 90rpm\n\nCooldown\n- 10m 50%-40% 80rpm"
}
]
- download and install Postman
- left panel, “My Workspace”, create a new Collection (+ button)
- select your new collection and in the authorization tab select “Basic auth”, then insert “API_KEY” as username and your api key (found in your intervals.icu setting page)
- in this newly create collection add a new Request
URL: https://intervals.icu/api/v1/athlete/0/events/bulk
change type (left to URL) to POST
in the “Body” section select Raw and paste your json
- Click “Send”
do a test with couple of workouts otherwise if something is wrong manually delete all the calendar entries could take some times
If you want to do more things or need more explanations with API and to check for JSON format:
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I just tried it and it works fine, thank you very much.
Wouldn’t it be possible to do some type of import directly in JSON to the library and not to the calendar?
you should be able with one of these endpoints
same procedure as before, slightly different JSON, see documentation
for example
{
"day": 5,
"folder_id": "xxxxx",
"category": "WORKOUT",
"type": "Ride",
"name": "VO2 Max",
"description": "Warmup\n- 15m 55-75% 90-100rpm\n\nMain Set\n6x\n- 3m 126% (340W) 95-105rpm\n- 3m <55% 80-90rpm\n\n- 24m 55-75% 85-95rpm\n\nCooldown\n- 15m <55% 80-90rpm"
},
folder_id is folder/plan ID.
day is the day of the plan (starting from 0), you can also use the actual date instead of “day” like in the example above
You can see folder/plan ID in the upper right corner of the edit folder/plan modal window
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Been using this for a couple of weeks.
Having continuous issues when importing - the workouts continue to import as “swim” instead of ride even with the type set as “Ride”. The zones also import as HR instead of power, but I think this relates to the swim type more so than anything else.
Importing through Powershell (per Github) which works, but I don’t know if this is what is actually causing the issue.
Any recommendations to fix this? I have tried with AI to get it right, but still not working.
An example of my json file:
"date": "2025-03-11", "category": "workout", "type": "ride", "name": "Sweet Spot Intervals", "steps": [ {"duration": "10m", "zone": "Z2", "description": "Warm-up"}, {"duration": "12m", "zone": "Z3-Z4", "description": "Sweet Spot Interval 1"}, {"duration": "4m", "zone": "Z1", "description": "Recovery"}, {"duration": "12m", "zone": "Z3-Z4", "description": "Sweet Spot Interval 2"}, {"duration": "4m", "zone": "Z1", "description": "Recovery"}, {"duration": "12m", "zone": "Z3-Z4", "description": "Sweet Spot Interval 3"}, {"duration": "5m", "zone": "Z1", "description": "Cool-down"}
Hello, I am the same as you, I find it very interesting but the tool is not correct enough for my use, since like you, I also train for power, it would be interesting if I could do it by power zones or better yet, for a % of the FTP value.
Regarding this type of issue, I have already made a request to the creator through Github. Here my petition: Support workouts based on % FTP · Issue #5 · h3xh0und/intervals.icu-api · GitHub
Regarding the second section you mention, swimming, the problem is not the generation of your code but the code of the import tool, I was fighting and I found the reason, let me show you:
formatted_data.append({
"start_date_local": training["date"] + "T00:00:00",
"category": "WORKOUT",
"name": training["name"],
"description": "\n".join(description_lines).strip(),
"type": "Ride" if "Bike" in training["name"] else "Run" if "Run" in training["name"] else "Swim",
"moving_time": sum(
convert_duration(step["duration"]) for step in expanded_steps
),
"steps": expanded_steps
“type”: “Ride” if “Bike” in training[“name”] else “Run” if “Run” in training[“name”] else “Swim”
What this code does is that when you run the script, if the activity has the word ‘Bike’ as part of the training then it will be training of type ‘Bike’; if you have the word ‘Run’ as part of the training then it will be ‘Run’ type training; If it does not meet any of the other conditions then it will always be of type ‘swimming’.
This is how it is implemented in the code, so regardless of the format and type of your JSON, when you run that script and upload it to your Intervals.icu it will change it.
For the latter, regarding the type of training there is no major problem than editing the code, even if you are not familiar with the code (I am not) it is as simple as changing that part and making it always ‘Bike’.
For the power part, I have not been able to modify the code, I have been testing but without success… let’s see if the creator of the project or someone with knowledge can help us.
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I temporarily fixed this based on the code by simply include ‘bike’ in the title of the workouts - told GPT to do this and it imported correctly.
However I had the same issue with Zones (HR instead of Power) as what you did. Will see if I can find a fix for that by changing the fields in the JSON.
Will revert back if I do.
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I found the ‘issue’. 
In the config section of the script the ‘$zoneType’ field forces all to go to HR based workouts. I have no idea how to submit this on Github. So any help there will be appreciated.
I have simply just commented this out (with # before the line) and the imports are now working and importing as power. Included an example of my workout in the json for reference as well.
Section of the code that is relevant:
> # --- Configuration ---
> $ATHLETE_ID = "ID" # Replace with your Intervals.icu athlete ID
> $API_KEY = "API_KEY" # Replace with your Intervals.icu API key
> $BASE_URL = "https://intervals.icu/api/v1/athlete"
> $zoneType = "HR" # e.g. "HR" or "Pace"
Example JSON Workout:
{
"date": "2025-03-27",
"category": "workout",
"type": "ride",
"name": "Bike - Threshold Intervals",
"steps": [
{"duration": "10m", "zone": "Z2", "description": "Warm-up"},
{"duration": "8m", "zone": "Z4", "description": "Threshold Interval 1"},
{"duration": "5m", "zone": "Z1", "description": "Recovery"},
{"duration": "8m", "zone": "Z4", "description": "Threshold Interval 2"},
{"duration": "5m", "zone": "Z1", "description": "Recovery"},
{"duration": "8m", "zone": "Z4", "description": "Threshold Interval 3"},
{"duration": "5m", "zone": "Z1", "description": "Cool-down"}
]
}
This is a neat tool!
Question:
When I try to upload a JSON file generated by the ChatGPT, the API returns a “JSON Parse Error”. I have no idea where it fails.
Is there any documentation on the json format that intervals.icu expects so I can ensure my file load correctly?