thanks seems like God advice !!
I don'T want to become a long distance runner, I just need to be able to run the 9 kilometers for a job, after that I sure as hell won't give a shit anymore

Howard, I inuured my hamstring early this year while running after a guy at the club and also in the first afterward haha
since then, my hamstrings are always so tight and stiff, so each leg workout (i train legs 3 times a week), I stech my hamstring with the little machine we have at the gym for that.
it helps TREMENDOUSLY !
really really big difference since I started doing that, I am now able to get my legs up to my head lvel, wich is pretty fucking impressive for me
