4 Sets
400m fast pace, 1 minute rest
200m fast pace, 1 minute rest
300m fast pace, 1 minute rest
100m sprint
Rest between sets: 500m walk
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4 Sets
400m fast pace, 1 minute rest
200m fast pace, 1 minute rest
300m fast pace, 1 minute rest
100m sprint
Rest between sets: 500m walk