I don't have great knees to begin with, my knee cap doesn't line up correctly so the tracking can be off and there isn't much cartilage in there - but I started this program and I'm loving it!.. until I started getting pain in my knees.. I had to stop halfway through week 3. I don't want to give up on this but I'm concerned I'll injure myself.. any suggestions? when to push through and when to wait? how long to wait? what kind of support to use? Im at a loss .. thanks!