Restarting P90X and Knee Woes

So after a week hiatus during vacation, my husband and I just restarted P90X with the intent to actually make it through the program pretty much as designed this time. We didn’t do too badly during vacation as we went to the gym in the hotel twice, doing exercises we remembered from the program.
The first day back was Saturday when we did yoga. Recently, we had taken to skipping yoga, but rediscovered how great it is. Although it is long-about an hour and a half, the movements are great to build strength and compliment the program. We then worked out on Monday and did Abs along with Legs and Back. Sometime during the jumping jacks, I tweaked my left knee and was only able to make it through about 40 min of the Legs and Back DVD before having to stop. My right knee is considered my “bad” knee as I had surgery on it at 11 years old. Sitting there with an ice pack on my left knee was even more unnerving. My mom later reminded me that my knees are constructed the same.
“Floating” knee caps basically mean that my knee caps don’t sit as well as they are supposed to. They are more likely to slip out of the joint than most people’s. My right knee had done this at a weird angle and with pressure on it to prompt the surgery. It’s a constant in my head about being careful of my right knee. I believe that my subconscious has now just taken over and that my left knee tries to take any extra flack so my right knee is protected. This may be why I hurt myself in the first place. Luckily the pain only lasted for the night and the next day I was fine, but it was a good reminder that I need to be conscious of both knees. I thank P90X for the strength that my legs now have and believe that this brings great good to both my knees. With my quasd stronger and continuously gaining strength, they are better to hold my knee caps where they should be.
The next day we completed Chest and Back and the day after we completed Plyo. Plyo is one program that with my knee issues, I thought I wouldn’t be able to complete.My strength has made me more confident, but I’m still very careful with how I land and what moves I can do to not put my knees in more jeopardy. If you have knee problems, you need to build muscle first before trying to do anything remotely high impact. There was a physical therapist once that told me that some jump training stuff would be good for me. I didn’t believe him at the time that I could do things that I’ve been doing, but I guess that just means that he was right.
After taking yesterday off, we’re on to shoulders/arms and abs tonight! I’m super pumped and am ready to go!