20 min (or as long as possible):
Crank speed up on treadmill to your sprint pace....20 sec on, 10 sec off
*When you are resting for 10 seconds, completely come off treadmill
OR
If have an outdoor track...sprint length, jog width for 20 min (or as long as possible)
This run is good paired with 30 min of lifting if you have the time...see workout 3 (30 min lifting)
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