Make a commitment to those fitness goals by paying up front for your 12 month membership and pay...
No joining fee
There's no notice period at the end of your contract, so no fussing about with monthly payments, no hassle!
Joining the gym for a month or two will certainly go some way towards improving your fitness. Though for long term goals, a short term stint as a gym member isn't going to cut it. Making your fitness routine a part of your lifestyle, rather than a chore is the difference between those who smash their goals and those who quit feeling defeated.
By committing to a year's worth of fitness, you're totally owning those goals.