I have been going to my gym since August. Love it, although I don't go every day (I just don't have the energy levels to be able to work out that hard - medical problems). I load my nano with funky music that gets me going on the treadmill and I just keep going.
If you work it out, your gym membership is only a few takeaway coffees per week. Just remember to eat correctly and drink plenty of water and you will keep it up.. just think how much easier things get when your fit!!