Cheers,
Why 30 days - basicly for motivational reasons. It is simply more fun to do something aerobic, swimming, running, etc.
I have done serious weight training before for three or four times, and all of them have ended after a month from frustration "this is boring, and I'd rather be doing X, I have done this for a month with no results, maybe I'm doing something wrong!" or getting slightly injured and deciding that this is not worth it.
I know from my usual motivation span that the first 2 weeks can be done purely from the initial impetus, the following 2 weeks can be done with willpower, but my motivation will ultimately crash after that if I don't have any visible results, and I'd rather be drinking tar than continuing my trial after that - see you again in a year (or more) then.
The other thing is that I have so many 30-day trials waiting in line to be started and I don't want to postpone them too much by taking a huge 60 to 90 day trial (or probably I'll need to start multitasking at some point...)
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