Not wanting to disrupt my Monday Wednesday Friday training sessions, I still weightlifted today despite the fact that it was the first day of Ramadhan. Yes, preserving muscle mass is important but to me, it is more important to maintain your exercise routine. The worst thing that could happen is you lose your momentum just because you have to fast for 30 days.
Admittedly, I was slightly weaker even though I had a pretty decent meal and on top of that, took half a serving of True Mass before training. My grip wasn't as strong, but I made it through my basic routine of squat, deadlift and bench press. But I feel good.
Maybe it's the first day and the toll of fasting has not taken its full-blown effect on me yet. But I'll take it one day at a time.