3 Rounds Is A Must

Last time when I always walk in Bukit Kiara Hill, I will just do 1 round and when I come down, I will always yawn without fail. I guess that time I didn't walk / run enough that is why there is not enough oxygen in my brains / body.

But the other day when my friend and I went to the same place, we walk like 3 rounds and even did running up the hill which is quite a crazy way of doing exercise but it was really great. After the walk, I didn't feel that sleepy. So I guess 1 round is not enough, there is a need for at least 2 or more. Do more never mind, don't do less :P