If you've ever wondered why your regular ol' gym routine just isn't the same as it used to be, consider changing things up. After all, because muscles have memory, they adapt to your exercises and you may hit a plateau after using the same piece of equipment after a period of time. For example, if you're accustomed to using a bike, use a treadmill instead. And in your strength training routine, mix up the order of exercises and mix free weights with machines. It's a good idea to vary your exercise routine every six to eight weeks so things don't get boring and so your body gets the maximum benefit from your workout.
I didn't know if that's what you meant, or if you were just talking boredom-wise. But I heard that runners stop losing weight after awhile. Your body gets used to running 4 miles, so if you stop, you'll gain. Important to change it up to keep your body on your toes. Otherwise, it's gonna be: Run, Forrest, run!
In my experience, changing your workout to break the plateaus is more effective if you are in shape.
Oh, and being a natural athlete helps.
I change my weight routine every month. I don't do that much weight training -- just for toning and keeping the metab in place.
I play racquetball about three to four times a week. If I change this the slightest, such as change people I play with or play more singles than doubles or visa versa, I notice a positive result with my body -- more energy, stamina and toner.
Also, if I take a day to do some sort of activity that is completely different from my normal activity, like hiking, biking or playing soccer, I notice a big difference in by body's attitude -- it's like shocking it into a new plateau. Awesome!
I used to do the same weight training routine all the time, one for about 8 months until I noticed, although I was in great shape, I was not increasing the amount of weight I would use on any of my exercises, I was benching the same 175 for 4 months, not being able to lift more - it was not until a trainer told me try a completely different routine that I started lifting more. If you stick to one routine, you risk not working out everything, and you could be missing things that you don't even know about - having many different exercises for each muscle and changing them often, helps avoid this