Here is just one tip I have found helpful in getting back on the "fitness" wagon. I seem to workout more when I have an end goal in site, like a 5K, or a fitness competition, or a triathlon, etc.... However - once I reach my end goal I decide to take a very long unnecessary break- which will stop NOW! I encourage each or you to look for an end goal to get you consistently working out and eating right, and then just stick with it-- make it a habit for good.
Here are 2 goals that I think are a great start. The first is Couch to 5K - if you are not a natural runner like me, this plan is great!


Another great plan is the 6 weeks to 100 push-ups challenge. I'm personally taking this one on right now! So far so good!
Getting to a healthy lifestyle takes one day at a time, until you have reached the point of habit, and then you just have to stick with it-- and not take super long breaks. It is much easier to fall off then get back on.
Good luck and I would love to hear what your goal is that is helping you be consistent in working out and staying in shape!