i would like to take 3 seconds off my 400 time this next year in track. (my p.r is 64.3, im going into soph. year and would like to be down to a 55 by end of senior year). I am doing cross country to help with endurance, but if anyone has any tips or exercises that i could do, either at home or on my own time, that would be a big help!thanks!
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