OK so this is my personal opinion and of course it works for me. Hopefully it will help you too...
If like me you have joined a gym only to end up paying for something you don't use, or have purchased some kind of exercise gadget from the TV and at this moment cannot confirm what bed its currently gathering dust under, then you're probably part of a largish group of people that try and do the 'right' thing by starting an exercise regime because they 'should' only to give up in a pile of de-motivation and self loathing.
I've been there time and time again and to be perfectly honest with you I'm not going back to 'exercise' in the form it has taken in my head for the last 20 odd years.
To most of us, exercise is supposed to be difficult. 'No pain no gain' type stuff. Hardcore commitment. Expensive gym memberships. Looking like Arnie.
None of those are helpful in the least and if you consider 'exercise' to mean the same thing to you, its probably time you changed your opinion of it if only to save any more frustration and failure at trying to be 'good' and doing the right thing.
I could go on here but I blog about it somewhere else and also, I'm at work right now LOL. PM me if you want the address etc. but I'll make the solution to this cycle of failure short and sweet here;
Start associating the term 'exercise' to mean things that are in fact enjoyable rather than painfully sacrificial. I'm talking about playing with your children (or nieces, nephews etc), challenging an office colleague to an arm wrestle for lunch or just taking a gentle stroll in the park.
Its all exercise (because you're using your body) but its not extreme and its much more natural.
You get the idea hopefully x
Jen