I thought I would do 2 min and 1 min jog cos I do on treadmill,
so if 20 secs the speed haven't go up + I no discipline to keep the
same speed without external help
oh...threadmill, yeah then the 20 sec on 10 off doesn't quite
work.
one joker I know runs 400m(run, not jog) around the running
track, walks 400m, then repeats until he cannot tahan anymore.
seems to work really well for him.
