The first thing to understand is that the two most important things to racing well in cross country are the connection to strength endurance and power endurance related to your aerobic support (normally 4mmol threshold) of your base training.
A lot will depend on the type of training you have done in the past and what your strengths and weaknesses are. The tougher (hilly, technical, long grass) the cross course or muddy, the higher you want your strength endurance to be. Hill-work or circuit-work are two of the best methods to ensure this is at high level during racing season.
Examples of strength endurance workouts we use are:
You need both strength endurance and power endurance to be a great cross country runner but the direction and percentage will be on the type of cross you will be running and your natural strengths.
When a course is flat and fast the direction will shift to power endurance or long intervals or fast continous intense runs (tempo) that build a specific endurance related to this.
Of course good aerobic support, mileage, long runs connected to both these methodologies will ensure you are prepared for all types of cross country racing.
I hope this can help the athletes looking for cross country specific information/workouts.