Are you afraid of the dark? If you are, you'd better get fit because "time and tide wait for no man"... and to get in before night draws in will be a real challenge. Head torches are essential for the mere mortals among us.
Ensure you are fit to train or seek a medical professional's opinion.
Always warm up for of 5-10 minutes before engaging in vigorous exercise or stretching.
Stick to this workout in the 6 weeks leading up to the event and you'll not go far wrong. Make sure you spend plenty of time stretching and eat the right foods, especially in the 3 days before the event. For more info speak to a personal trainer.
Get that core tight and strong with;
Repeat the above workout 2-3 times per week and increase reps and duration as the weeks go by and you'll be fighting fit!