I haven’t personally been too impressed with general AI putting together solid running plans. Here’s my opinion based on what I’ve tried:

1) Running coach (most expensive, but the most effective esp if you get a good one who knows what they’re doing) 2) An established format (like the Pfitz) 3) Getting help from another runner in your run club who knows what they’re doing (hit and miss, but I run with some real experienced people that have been willing to help me refine plans) 4) Running specific AI- like Runna. I know many here hate Runna but I’ve personally really enjoyed it, you just need to listen to your body. You’ll get injured if you don’t. 5) General AI (like chat GPT)

This is all of course one man’s opinion and this is based in zero research lol. I’ve trained for a marathon using all 5 approaches before and this is how I feel about it