When I was running yesterday, I realized I haven't really improved much on my running in terms of how far I can run before taking a break. And you know what? That's okay. So I can't really run more than 1.5 miles before taking a walk break. If I focus on that aspect of my training, I'll lose sight of the total distance which is important. I'll worry about that later. I'm already doing a lot better than I was two months ago. Progress can be very slow, and that's natural for everyone. In fact, CNN has a great article about why some people give up working out. Now gyms see the natural decline from people giving up on their resolutions and goals already. Come on folks - it's only been 28 days! Of course you haven't become a marathon runner/body builder/triathalon winner yet! Your body is still adjusting to the fact that you're being more active.
It's tough to keep motivation high when you're frustrated, but I promise it gets better with time. Trust me; I know. =)