[Pansy-Mae]

I've been meaning to ask, why do people cycle?

Several reasons:
1) The natural female hormone production varies throughout the month and it seems like a reasonable thing to emulate, to some extent at least. Nobody knows for sure if it helps, but it can't really hinder too much.
2) There is a theory that the body can get desensitised from a constant hormone intake level and cease to react to it.
3) Taking too much can lead to a 'stall' so a cycle hopefully reduces the chances of inadvertantly going too high for too long.

PS... my immediate answer to the question was, "Because its quicker than walking!"