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First time poster. I've been running for about 4 months and I'm now running 10k at about 1.05 outside and 56 mins on the treadmill 4 times a week. I only run 10ks.
Yesterday for the first time I went out for a run with some guys from work at lunch the run was 6k. I found it extremely difficult and I was really hurting (legs, ankles, knees) when I finished. When I checked my splits they are almost exactly the same as my first 6k in a 10k run?
So... I would like some advice
1. why was it so hard?
2. How can I increase my speed over shorter distances.