Even if you’re not racing, 100 km is a long mountain bike ride! Respect the distance.
You can train for this. Given the short period of time, use the trainer and road.
Generally, you can get by on 3 days per week. Distance and intervals. Add more of both, a little at a time.
Long road ride, 90 minutes or more
Flat to rolling terrain. Smooth high cadence
Hilly road ride, 30-60 minutes
5-10-20 minutes at a hard pace
Recover for one minute and repeat
Hard road ride, 60 minutes
30 second intervals: 30 seconds effort, 30 seconds recovery
Pedal easily for 5 minutes and repeat
Fit in mountain bike rides occasionally to keep up or build your skills.
You can train for this. Given the short period of time, use the trainer and road.
Generally, you can get by on 3 days per week. Distance and intervals. Add more of both, a little at a time.
Long road ride, 90 minutes or more
Flat to rolling terrain. Smooth high cadence
Hilly road ride, 30-60 minutes
5-10-20 minutes at a hard pace
Recover for one minute and repeat
Hard road ride, 60 minutes
30 second intervals: 30 seconds effort, 30 seconds recovery
Pedal easily for 5 minutes and repeat
Fit in mountain bike rides occasionally to keep up or build your skills.