Michele - I have P90X. I have never tried it with cycling, but I did try it one year with the half marathon I was running. It did not work too well. It is a pretty intense program. There are other programs that would be better with a cycling program ramping up to a big event.
I weight train up until 2 months before a big event, then I switch to a mix of yoga, ab work and cycling or running. After the event I'll add weight work back in. That works best for me.
Now, that being said, if your DH is interested, you can always do half of the sets - he does everything twice. And it's not very lower body intensive (the lower body reps are fairly light weight, and he throws in Plyo work which is great but intense). It IS a good program. So do what works best for you.
Christine
Life is not measured by the number of breaths we take, but by the moments that take our breath away.
Cycle! It's Good for the Wattle; it's good for the can!