I don’t know why everyone here is telling you to just take electrolytes! I’ve found that fasting and lifting do not mix. I do not fast on days that I’m still recovering from lifting. Your muscles cannot repair themselves without food.
Same experience here. I did like 4 miles of running right when I started a fast. After two days of fasting I tried running again and I was just exhausted. But after I ate again man could I run
So yeah, growth hormones increase during a fast, but thats just instructions to grow and rebuild tissue. But without the raw materials you can’t do that until you start refeeding (again, just to reiterate that must be done sloooowly)