intro myself - middle distance increase

hi guys, I am a 28 yr old female

wanting to increase speed for middle distance running without losing explosive power towards the end of the race.

I have done sprint training (100m and 200m) during my teenage years but since then stopped when I moved onto other sports .

Recently, i have started to run 2k and after 1.5k, I really felt like I was losing breath and just hanging on in there - but I am not sure if it is a case of cardio strength or muscle strength.


Does anyone here understand the dynamics / balance between CV and muscle strength in running?


The second question is sometimes my mind plays tricks on me - I feel like I run the pace of a snail but the result time is better than I thought whilst other times I felt like I run like a wind but the times are slower than expected
 
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