Green shoots?

 I've started reading a book called Beyond Training mainly because Cheryl recommended the author (Ben Greenfield) for his knowledge of training and racing while on keto.

Anyway, after reading a chapter on training, I realised that I probably ought to do more really hard HIIT and tabata style interval sessions.

My legs have been empty ever since I stopped eating carbs almost 2 weeks ago and each time on the bike has felt really tough, like nothing I've ever experienced before except maybe the feeling at the end of a marathon.

But my energy does seem to be slowly rebounding, so today I tried a short HIIT style session, one of Zwift's standard <30 min workouts, Sevens. Basically, 2 sets of 7 intervals with 30 seconds at 120%FTP and 60 seconds at 65% FTP. Normally this would be easy (so I'd argue not intense enough to be called HIIT) but given my empty legs, I thought it would be a good test.

I still had the empty legs feeling, but perhaps not quite so bad as before, and I managed to complete the workout without resorting to dropping the trainer difficulty percentage. HR was 150 (avg) and 172 (max). I don't have a pre-keto effort to compare against, but I strongly suspect these HR values are much higher than they would have been. But it's a start!