I've mentioned my aunt before; she's an amazing lady, smart, successful, and healthy. She made a conscious decision some years ago to get well and truly healthy, and for the most part, she does a damn fine job of it.
She's the source of my favorite quote: "Be inefficient." It's one of her lifestyle philosophies. Basically, it means, stop doing things the easy way. Sure, it's quicker to drive half a mile to the store for a can of soup... but by being inefficient, you can take a more healthy path, and walk or ride a bike. You part at the far end of the grocery store parking lot, instead of right by the door. Things like that.
She has another saying that's one to live by:
"If nothing changes? Nothing changes."
This one's pretty self explanatory, but it's one that most people don't see to get deep down. Basically? It means that if you do the same thing all the time, how can you expect anything to be different? It applies to all portions of your life. If you sit on your butt day after day, nothing can get better. You won't lose weight. You won't get more money. You won't stop being bored.
So if something's not working... you need to shake things up. With respects to exercise, this is actually a pretty effective means of plateau busting. As your body gets used to doing something the same way all the time, it gets more efficient at it... and burns fewer calories. That makes it less effective. If you go out right now, and walk 2 miles three times per week at the same speed... eventually, you'll stop burning as many calories.
So, nothing changes.
The same goes for diet. If you're constantly dieting, and it's not working... nothing will change. Why would you keep doing the same thing over and over again? Stop dieting!
So if you're stuck, try something new. Switch up your exercise routine. Try a different calorie range. Eat more. Measure. Stop eyeballing. There's thousands of new things to try... try them!
After all, if you don't do anything differently? Nothing will change.