Endurance workout:
1000m Run
Rest 4 min
1000m Run
Rest 3 min
1000m Run
Rest 2 min
1000m Run
Rest 1 min
1000m Run

*Your goal is to keep the same pace

Scaled:
600m Run
Rest 4 min
600m Run
Rest 3 min
600m Run
Rest 2 min
600m Run
Rest 1 min
600m Run
*Your goal is to keep the same pace