You know which site this is from already. Sorry to even link it here.
Anyway, the 'amazing' claim is that Muslims here are running a 5km run during Ramadan, during their so-called 'fast'.
Now a bit of background: I used to be an avid runner. I'd run at least 30km a week, 5km is the bare minimum and I used to do it regardless of food/water during the heat of summer. Of course it's always nice to have a drink or something to eat beforehand but it's not necessary unless you're literally starving. Let me just say that a 5km run is not something impossible at all.
Next up, Ramadan. I lived in a Muslim country. I had Muslim friends. They can eat all they want too before a certain time of day, then they can eat again at night. They literally gorge during these periods. Huge curries, loaves of bread, drinks, etc, you name it. They eat a ton at night too just because they miss it throughout the day - and there's even things that they can sort of get away with eating/drinking if they're not too worried about strictly keeping the fast. And a lot of them are fat - I'm not saying that about all the people in the video - but it's true. Fat and slovenly, I would add. Long story short: Muslims overeat during Ramadan to compensate for the temporary fast.
So basically what this video is bragging about is people gorging themselves in the morning, then going for a run in what looks like the early morning/afternoon, then getting to eat again later on. The no-water thing is kind of silly but they also load up on drinks. Basically any runner will tell you that if you load up on carbohydrates a few hours before you run, the run will be easier. That's all they're doing.
Okay, so they did it for charity and that's nice. Okay, so they seem to be taking their stuff seriously. But it's -not hard- and it's not different from going on a normal fast during training so that you can bulk up on protein the next day. It''s nothing to brag about, it's nothing intrinsically holy and it's actually rather boring. So you don't eat or drink for a few hours of the day? Wow. And you go for a short run? Double wow. I'm not trying to be mean here but it does get a little bit patronising hearing about the 'sacrifice' of this fast and how hard it is, when it's actually not.
Edit: I will also add that many of my Muslim friends would look forward to 'fasting' because it meant massive feasts and eating/drinking way more than normal. Not to mention parties and being invited over for food. The whole idea that they are suffering somehow is completely conjured up by Western media.