Fartlek Workout: http://bit.ly/2fzxZyz<br /><br />-90 Sec @ 5K pace <br />-60 Sec @ Mile pace <br />-30 Sec @ 800 pace <br />-15 Sec @ 400 pace <br />X4 <br /><br />-60 Sec Rest Per Rep<br />-2 Min Rest Between Sets
