I don’t have much experience, but i continue short runs on the treadmill. Currently day 3 of 5. I will take an electrolyte supplement once a day.
I never felt dizzy or weak or anything. I would stop if I did.
Weight training might work —- but —- not sure. On the one hand, during a cut, training prevents muscle loss. But full fast? I feel you need protein to repair muscles — or you’re spinning your wheels. …. I mean a 18-36 hour fast, sure, do weights. But longer it doesn’t feel right - though I never tried it.
But the running I feel is fine. Our ancestors surely ran on a fasted state. It’s called hunting. Plus i enjoy burning another 300-400 cal a day.
I, also, exercise while fasting. I go for walks daily, and will weight lift in a fasted state. I also don’t take an electrolyte supplement. Like others have said, listen to your body and do what’s right for you
I just did a 5/3/1 squat day at the tail end of my first 48 hour and it was monstrously brutal, but I was able to complete it. It all depends on how you feel in the moment. Next time I do it I’ll only do hiit or walking while fasted and do the weight training on feeding days. I plan on doing 48 or 36 hour fasts weekly so still playing around with how and when to work in weights.
I exercise while fasting. I just stick to my usual routine of one day cardio next day strength with 1 rest day and one of those cardio days being just a long walk. If I’m behind on electrolytes I definitely get more sore and the soreness lasts longer but that’s really all that happens for me