Originally Posted by Yael Grauer
I did 15 seconds of sprinting and 45 seconds of rest on a treadmill for 20 minutes five days a week when I was trying to improve my run time in my pre-Crossfit days. It was an idea from a boxer/boxing coach/SF stud I know. I got my 12-minute mile down to a 7-minute mile this way.
Funny...I probably would of added some 400meter intervals thrown in (aka 1:30min of sprinting)...but just goes to show....they all get results....