Ok, doing a search for weighted stuff while trying to do some research I came across this site:
http://www.uihealthc...s/exer3110.htmlPart that had me surprised:
To improve your running speed, you may want to try wind sprints. Integrate wind sprints into your regular jog or run. Run faster than usual when sprinting for 3 to 5 minutes, then slow down to your normal jogging or running pace to recover for half of what the sprint time was. Repeat this 3 times. The principle is to go fast enough to get a little out of breath. Then return to the pre-sprint pace. Do wind sprints only once or twice a week, no more.
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3-5 minutes of sprinting?!?! I think most people would die from that. 20-30 seconds, maybe, but sprinting is going all out as fast as you can. If humans could sprint for 5 minutes straight, they could run close to 2 miles in that time. (world record for 1 mile being slightly under 4 minutes, and even world class athletes don't sprint the whole mile) I think by "sprinting" they probably mean "running slightly faster than you would normally".