1st time intervals

Today I did intervals for the first time... the most running I have EVER done. Even though it was not much, I feel some progress. I did 1:3 for 2 miles. My knees, shins, legs did pretty good, my breathing was my problem. I need to do something for that, I guess that is where the XT comes in. I am AMAZED how easy 1 mile is... I did 4 miles yesterday morning and then last night went for a walk with my husband and dog and we did 1.6 and it was a breeze, go figure, this program really may be working. Thanks again Mark, Robin and Matt. I hope I am still saying all of this when it is 95 degrees with 80% humidity........yikes, why did I even bring that up right now and spoil my mood. Have a great day everyone.