One of the most overlooked items is body weight exercises. Lots of hindu squats, pushups, and core exercizes.
Just put in time on the bike. Get a headlamp and night ride. Lots or road riding is also good for the TR. The bottom line is you will need to put in miles on consecutive days, or it can become "uncomfortable" very fast. Also the family will have to understand that you going in this race is all about setting goals and reaching potential. A little hard for very young kids to understand though.
Here is a training sched that will minimize discomfort:
[font=Times]Stage 1: 5 weeks - Road/Indoor Trainer Base-Building[/font]
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[font=Times]Purpose:[/font]
[font=Times]Build cardio and strength foundations with increasing miles on a road bike/indoor trainer. Even serious mountain bikers need to hit the road, as they generally aren’t accustomed to long rides. Avoid hills; mileage is key. (Road with a good base can substitute some mountain biking if desired) Long rides should be done at 65 to 80 percent of maximum heart rate (you can estimate yours by subtracting your age from 220).[/font]
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[font=Times]Training:[/font]
[font=Times]One long road/trainer per week, progressing 30, 40, 60, 80, 100 miles.[/font]
[font=Times]Four cycling sessions per week one or two hours, either on pavement or in a spinning class.[/font]
[font=Times]One hour-long run per week (to develop muscle tone and tolerance of pounding).[/font]
[font=Times]One upper-body weight session per week, including grip exercises.[/font]
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[font=Times]Stage 2: 3 weeks - Off-road base-building[/font]
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[font=Times]Purpose:[/font]
[font=Times]Improve your dirty-specific cardio and strength foundation while developing climbing and descending skills.[/font]
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[font=Times]Training:[/font]
[font=Times]One long mountain-bike ride per week, progressing 40, 60, 80 miles.[/font]
[font=Times]Four cycling sessions per week, one or two hours on dirt or on pavement.[/font]
[font=Times]One hour-long run per week.[/font]
[font=Times]One upper-body weight session per week, including grip exercises.[/font]
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[font=Times]Stage 3: 3 weeks - Interval training[/font]
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[font=Times]Purpose:[/font]
[font=Times]Continue building foundation with long rides, but get your body used to the high heart rates and work effort of steep terrain with intervals (i.e., repeats). Do you long ride the day after an interval session to simulate race conditions. Find a continuous hill at least three miles. Try to descend on “single-track” to hone your handling skills. Intervals should be done at 85 to 95 percent of maximum heart rate.[/font]
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[font=Times]Training:[/font]
[font=Times]One long mountain-bike ride per week, progressing 90, 100, 70 miles.[/font]
[font=Times]Two interval sessions per week, progressing as follows:[/font]
[font=Times]Week 9: 8 x 1-mile repeats.[/font]
[font=Times]Week 10: 6 x 2-mile repeats.[/font]
[font=Times]Week 11: 6 x 3-mile repeats.[/font]
[font=Times]One hour-long run per week.[/font]
[font=Times]One upper-body weight sessions per week, including grip exercises.[/font]
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[font=Times]Stage 4: 1week - Taper[/font]
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[font=Times]Purpose:[/font]
[font=Times]Be rested for the race, but stay toned.[/font]
[font=Times]Training:[/font]
[font=Times]One 40-mile mountain-bike ride.[/font]
[font=Times]Two rides on dirt or pavement, 60 to 90 minutes.
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