this post was submitted on 05 Apr 2024
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Haha I don't have any particular research skills... I asked the AI-bot of the ecosia search engine.
But as mentioned above: I am not sure if this answer is correct...
I asked ChatGPT and it said it stood for Custom (set your own timing program) and Free (workout as you wish and press a button to record the times for later use). Not a bad idea but I had told it F is for the active period and C is for the resting period, so it is obviously wrong. Another wording gave me Focus / EFfort and Cool-down / Catch your breath.
I tried the Ecosia AI chat too, pasting the post title and it replied with Focus and Catch your breath.