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Intermediate 5K
Day 051 - Set Time Intervals
10-minute endurance (EN) warm-up run at level 2 intensity (70-75% MHR) followed by a 15-minute interval (IN) run at level 4 intensity (80-90% MHR). Cool down with a 10-minute EN run at level 2 intensity. 
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TODAY, DO AN INTERVAL (IN) RUN FOR 15 MINUTES AT LEVEL 4 INTENSITY. Pick a favorite trail or park and warm up for 10 minutes. Do a set of timed intervals, run at level 4 intensity for 2 minutes, recover by walking easily for 30 seconds, repeat 6 times. Cool-down for 10 minutes by walking or jogging.
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