I'm following the C25K program 3X per week and chatting with others who are also following the program. I also go biking with a friend for about an hour (18 miles) each Sunday. I have participated in some of the exercise challenges here in past months and am getting myself motivated to try the challenge at
hundredpushups.com.
I have found that the challenges and programs provide some measure of accountability which makes it more likely that I will actually follow through. Without the
C25K program, I'd probably push myself too hard early on and burnout quickly. If my friend was not asking me what time we were biking on Sunday, I'd probably have a harder time forcing myself to go out each week on my own.
Also, a previous comment suggested that anaerobic activity (weight lifting) was not as important as aerobic for weight loss. I would have to disagree (they are equally important) as it is your muscle mass that burns off calories more rapidly while doing nothing. Of course I can't be a major proponent when I'm not including much anaerobic activity in my own regimen. LOL -- do as I say, not as I do!