I like to upload my workouts to Strava. I usually track workouts using the WorkOutDoors AW app, which offers an “Upload to Strava” button after ending a workout. It's simple and works well. This is low priority, but it would be nice to have someday. Strava has a nice API, easy to use: 1. Authenticate via oAuth flow to get a persistant token (just once). 2. Upload workouts using the [Upload Activity](https://developers.strava.com/docs/reference/#api-Uploads) API endpoint. Here's instructions from ChatGPT for implementing this in Swift: To upload a workout with timeseries heart rate data to Strava, you'll need to create a file in a supported format (e.g., .FIT, .TCX, or .GPX) that includes the heart rate data. Here, we'll focus on creating a .TCX (Training Center XML) file, as it's a common format for such data. After creating the file, you'll use the Strava API's "Upload Activity" endpoint to upload this file. ### Step 1: Create a .TCX File You need to create a .TCX file that includes your timeseries heart rate data. A simplified .TCX example with heart rate data might look like this: ``` 2024-02-21T09:00:00Z 3600 2024-02-21T09:00:00Z 120 ``` ### Step 2: Upload the .TCX File Using Strava API After creating your .TCX file, you'll use the Strava API's "Upload Activity" endpoint to upload the file. Here's how you can do it in Swift, using `URLSession` for the network request: ``` import Foundation let token = "YOUR_ACCESS_TOKEN" // Replace with your actual access token let url = URL(string: "https://www.strava.com/api/v3/uploads")! var request = URLRequest(url: url) request.httpMethod = "POST" let boundary = "Boundary-\(UUID().uuidString)" request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type") request.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization") let fileURL = URL(fileURLWithPath: "path/to/your/file.tcx") // Path to your .TCX file let fileName = "workout.tcx" var body = Data() body.append("--\(boundary)\r\n".data(using: .utf8)!) body.append("Content-Disposition: form-data; name=\"file\"; filename=\"\(fileName)\"\r\n".data(using: .utf8)!) body.append("Content-Type: application/octet-stream\r\n\r\n".data(using: .utf8)!) body.append(try! Data(contentsOf: fileURL)) body.append("\r\n".data(using: .utf8)!) body.append("--\(boundary)--\r\n".data(using: .utf8)!) request.httpBody = body let session = URLSession.shared let task = session.dataTask(with: request) { data, response, error in if let error = error { print("Error: \(error)") return } if let data = data, let dataString = String(data: data, encoding: .utf8) { print("Response data: \(dataString)") } } task.resume() ``` This Swift code constructs a multipart/form-data request to upload your .TCX file to Strava. Make sure to replace `"YOUR_ACCESS_TOKEN"` with your actual access token and `"path/to/your/file.tcx"` with the path to your .TCX file. After uploading, Strava processes the file and creates the activity, including the timeseries heart rate data.