Karen, how long have you been riding?

Training is very specific. To train yourself to ride a metric, cycling is the most effective thing you can do. While a boot camp may help improve your general fitness, it won't help you with the specific demands of riding 64 miles.

If you were able to ride 50 miles this week and planning to ride 64 miles next week, I would say "no problem." However, if you're planning to take three entire weeks off the bike, especially if you're new to endurance/distance riding, I'm afraid you won't have a very positive/comfortable experience and may risk injury incurred during the event.

Lorri