The first time I tried lifting weights after not eating all day, I felt weak. I could get through the entire workout, but I had to decrease the amount of weight I was using on almost every exercise. Over time, however, my body made the adjustment. I’ve now set personal bests on every exercise I do. From what I’ve read, you have to allow your body to make the switch from being a sugar-burner to a fat-burner. This is why following a Keto diet is so popular among OMADers. I don’t do Keto, but I don’t eat a lot of carbs either. I do have a cup of black coffee prior to working out. But I was doing that even before OMAD.
In terms of the actual workout, I stick to compound exercises (squats, deadlifts, bench press, etc.) doing 3 sets of 6-8 reps. I do have to rest more. Before OMAD, I would rest maybe 1 minute between sets. Now I need two minutes. That might be because I’m working out fasted. Or it might just be because I’m lifting heavier than before. But whatever qualms I had about lifting weights while fasted have been erased.