Many times during my early 20's and onward, I have joined gyms. I would pay my membership and then not go after about a month. My level of committment was pretty low.
Now and for the last year, I have been doing Pilates exercise beds....yes, you can get other forms of exercise while in bed!..... and I pay by the month and go 5 times a week. They expect you to call if you are not able to make it and they, in turn, keep the classes down to 5 or 6 participants.
So really what I am saying is, the small classes work better for me than the ones where you will not be misses at all....or you have to self direct your time spent there.
Just the fact that they are expecting me and in some cases, the classes are cancelled if only one person shows up......so there is pressure put on you by the other attendees, for you to attend to make up enough people to hold the class to begin with.......
This exercise works for me!
:p