When you don't feel like excercising...

Sheer willpower, lol. There are days when it just won't happen, but I'm getting better.

I try to imagine what I'll look like if I can do this every time. I try to keep my goals in the forefront of my mind. I read the success stories here. Anything to motivate me.

If you aren't enjoying your workout, find one which you do enjoy. If you usually enjoy it but don't feel like it on a particular day, take a day off.

When I don't feel like doing my workout I just tell myself to do 15 minutes instead of 30. I can do 15 minutes and next thing I know 30 minutes has gone by and I feel great about it.

^^this^^

Sometimes I take even smaller baby steps (... ya know, when I'm being a big baby about it ). First I tell myself that all I have to do is show up at the gym. Then: all I have to do it get on the treadmill. Then: all I have to do is 10 min. By then I'm starting to give in to it, and it switches to: I've already done 10 min, I bet I can do 5 more. Then: 15 wasn't bad, let's keep going. And I really do stop when I'm ready to be done, but that may be 25 min or 45 min or 65 min. None of which I would have ever gotten done if I said "I'm going to do 65 min on the treadmill today."

I have a couple more tricks too, depending on how whiny my internal-self is that day. One is that I download shows onto my phone and play them through my workout so that I tell myself that I can't be done until the episode is over. Another one is go to a fitness class because I know that once I'm in the class, I can't really leave until it's over.

How do you make yourself do the workout which you planned before when you don't feel like doing it?

Easy. I look at what I'm doing and plan on setting some sort of PR with it. The idea of a record gets me pumped for my workout. The last time this happened was on a deadlift day. So I set a new 1RM on my deadlift. BOOM.

Usually when I'm feeling unmotivated, I tell myself that I don't have to get in a heavy workout as long as I show up and do SOMETHING. Usually I'm just tired, so I tell myself that I can just get on the treadmill and walk slowly. Usually by the time I warm up, I feel stupid walking slowly and get into it.

Sometimes i already log how much i want to do so that way it is already made public on my page which makes me want to do it even more. Especially feels good when you see comments telling you that you did a good burn and what not.

I agree that wearing exercise clothes helps since you just want to do it more and more ready for it.

It's all about willpower. I remember what I'm working towards and what my goals are and that helps me get up and going.

I also try to mix my workouts up enough so that I don't get too bored or tired of one specific thing. When something becomes too routine for me and I start to get bored and feel like not doing it, I switch to something else for a bit.

If I don't feel like exercising, which has been most nights lately, I always remind myself how good I feel when I am done and then I just start. I always feel much better after I am done and much better about myself for doing it.

I am in the gym at work every morning at 6:30 for my 30-40 minute workout, I enjoy exercise at weekends, although I must admit on dark cold mornings I could quite easily stay in bed.
I intend to think of the extra calories I can eat later, once I am there and changed its no problem, unfortunately you just have to make it a habit and persevere.

Don't think, just do. When I sit there and think too much about how much it's going to suck, I end up not doing it. It's better to just do it.

Personally:

At first it's so easy! It's new, it's exciting and your doing things you've not done before (Or in a long time!). Eventually, it becomes a second nature until you start planning your work/social life around your workouts.

There are days when I don't want to go but I just do. If I REALLY don't feel like it I don't go much like I wouldn't go to the pub if I didn't fancy going. However, I tell myself that tomorrow ill run an extra mile to make up for it.

I use a list like this one: http://www.myfitnesspal.com/topics/show/551631-100-reasons-to-work-out-today

That usually gets me moving. I also have a quote that sits at my desk at work that says "Make moves not excuses!" It's from a workout t-shirt that I have.

I don't get to eat as much if I don't work out!

Also, I'm at the point where I'm actually pretty fit, even though I have a bit of weight left to drop. When I really don't want to work out (and for no good reason), I'll remind myself that fit people work out, they don't just sit on their butt and keep their endurance. That mindset usually helps a bit.

Also, find some exercise that you enjoy. There seems to be this notion that "exercise" means you have to do some DVD workout and/or drone away on some cardio machine for hours upon hours...I've done neither at any point.

Find something you enjoy doing. I like walking and taking hikes in the mountains and riding my bike...I enjoy weight training so I do that 3x weekly as well...but you'll never find me on an elliptical machine or doing some P90X thing...not my cup 'o tea and not necessary.