If you have to get in and get it done. This is the treadmill workout for you! As always, just do you and find the speeds that match with your zones as described in the chart. Keep your focus on your form and run on the treadmill belt, do NOT let that treadmill belt run you!

4 x 3 is a fun workout with 4 types of run in each set of 3 total.

4 Drills, 4 Hills, 4 Track Intervals.