not happening man. i was fit as shit when i was boxing and could only do 2.5km in 9min12sec.
for extreme fitness gain in rapid time do either 200mt sprints, absolutely flat knacker, stop for 30 sec and then do it again, repeat 10 times. then you can cut the rest period down to 15 breaths in between sprints the 12 then 10.
or hold your breath and sprint as far as you can, stop for 10 sec or 5 breaths and repeat.
this will absolutely fuck you but make you fittest the fastest and i would definately incorporate the 5-6km rum in every 3 days for the different longer duration kinda training.
drop some glutamine afterwards or you wont be walking so good after the sprints.
thats my old boxing training cardio work
i'm just a fucking legend. end of story!
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