Update, i just finished my roadwork...
it was INSANE! in addition to the usual 5k, i added an addition 1.2k of just sprinting, or running as fast as humanly possible, and it was not just good ol sprinting...the canadian weather is awesome and this was on a 400m hill, incline was high..i did 3 intervals of just uphill...boy was it intense! once in a while id land on a part of a road where there was thin/black ice and id almost lose my grip, its not such a big deal when jogging, but the same piece of land becomes potentially treacherous when your running your ass off on it...
in addition i read somewhere that ali (and later sugar ray leonard) added running backwards and side to side to their roadwork....so after the high intensity running, i added that, all in all this variety in my roadwork made it much more fun, interesting and challenging(especially the uphill sprinting) by the end of it i firmly felt that i could do another 5k no problem....I read a while ago cus d'amato talking about fatigue in boxing is mostly psychological, and im a firm believer today...
We usually see roadwork as boring, monotonous, dreary stuff we HAVE to do in order to get to the more 'exciting' parts of boxing, but if you make it more fun and challenging it becomes awesome..
Really its just your mind thats working against you...if you can somehow distract the mind (from the jogging, the sprinting and the pain) it becomes much MUCH easier somehow..
You first move beyond the limits of the body...then the limits of mind(which is VERY difficult)....and then into unknown territory...almost like being in 'the zone'
Edit
Also its really weird for your ankle area when your running that hard and fast and at a high incline(like running outside on a hill) (So be careful and mindful), at your max, your sprinting off, on the plus side i felt certain muscles in my thighs and upper leg work that i didnt know existed
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