Keep on keeping on! Anything with a weight vest and I mean ANYTHING is hard! Putting the damn thing on is hard! haha Which one do you use? I recently got a Unbroken Designs weight vest that I love, it is actually quite comfortable and uses sand bags for the weight instead of that hard iron that some use. It is also made with nylon so it stretches as you breathe and moves with you while you run.

I am pleased with it so far!