Today was my interval run. I did 6 miles of 1/2 mile fast followed by 1/2 mile recovery. I felt good for the first 4 miles but at mile 5 I started going uphill and my legs got pretty worn out. I also got a side ache around mile 5. I seem to get those when I have a rapid change of pace. I have not done a speed workout for a couple weeks so I thought it went pretty good.
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