Thursday: 20 mile bike; 4 mile run; abs

20 mile bike. 225w. Followed by a 4 mile brick run. I feel fine on the bike, but feel terrible running (and swimming for that matter). I was hoping for a longer run but don't have the confidence that I can run further without my shins acting up. I feel very sluggish, completely out of shape, and I am afraid to run longer than 3-5 miles. I haven't liked my new shoes and have gone back to the old ones I was wearing. Now the old ones don't feel good either. This isn't really the time not to be comfortable with your shoes or not to know what shoes you will be wearing for the race. Even still, I believe I have enough time to get my run right so I can achieve my goal.