Shake up your routine and keep it interesting with interval workouts like this.

Minutes Activity
0:00 Walk at a moderate pace for 2 minutes
2:00 Speed up and run as fast as you can for 20 seconds
2:20 Walk at an easy pace for 40 seconds
3:00 Run as fast as you can for 20 seconds
3:20 Walk
4:00 Continue running for 20 seconds then walking for 40 seconds until you reach 10 minutes
10:00 Finish