The sample Hill Fartlek Workout provided below can be made more difficult or easier depending upon your hill selection. As Fartleks are commonly for the "advanced" individual there's probably many hills you've encountered on your regular runs, simply pick an appropriate hill for your ability & workout purposes.

Hill Fartlek Interval Workout:

Warm Up: Light Jog (Conversational Pace)

Main Workload: Repeat 3 times.

2 x Up Hill @ Run Hard Down Hill & Between Hills @ Jog

Cool Down: Light Jog (Conversational Pace)

Remember, free sample gym workout routines are also listed on the Gym Professor web site.