When you exercise after a long lay-off (aka no exercise long
long), your body's immune system will generally weakened.
During this period, and especially for those wuss who cannot
sleep, their body's immune system takes a toll.
When these wuss didnt take care of personal hygiene, eat
sufficient fruits and drink water, these conditions will add up to
lower the immune system.
So they fall sick lor.

Anybody who cannot sleep, their body takes a toll. Anybody who
never take care of personal hygiene, their body takes a toll.
Sounds like tekong really f*cked you up to make you think going
through it is a big deal.
Also, tekong water does contain alot of microbes. While I was
there, at least twice a year -pipes had to be repaired. Asked
around what happened, sewage pipe leaking into main reservoir
pipe.
So yeah, wuss, what's your point? Do you DARE say you did not
ONCE fall sick in Tekong? Tsk, tsk.