I do lots of cycling in the past , mt Faber is nothing compared to overseas hills
Yah, this is a limitation of coz but it's just a soft limitation, the only thing is that it gets boring when repeated.
All these limitations don't prevent you from reaching your goals. Some poeple use it as an excuse actually.
It is in the mind, i can gun around Marina Bay area a good several times, just good for intervals.....can "see people" at MBS while recovering, before gunning again. Much safer than using the roads here at my South Side, unless if you can get up before 5am on weekdays then dont say.
Folks still can Everest here in flattish SG.
The concept of Everesting is fiendishly simple: Pick any hill, anywhere in the world and ride repeats of it in a single activity until you climb 8848m.
Likewise, SG is a small country but people still can do 100-200km here....
Im just on a foldie costing 1k and my 5k "TT" is reaching sub 8 ie above 35kmh "comfortably". (5k distance is simply coz i dont go tmcr or seletar, just a convenient TT distance, same for 3-5k for my running). Sprint/strength wise managed to hit 50.7km on a straight flat recently, albeit with tailwind (SE winds) and on GPS though no obstructions.
The same goes for running.......actually i find it even more challenging to try to racewalk faster than what other amateurs can run. (I did just that in 2023 AHM, LLST coz i suddenly kena injured after 6th km mark)
It's all in the mind.
But one thing for sure we do not get here is Altitude training. The closest i ever thought of is Genting Highlands.

I also dont think locally we have any hypobaric chambers like what i come across say in Japan etc.