<human>: Summarize the given text in a few sentences.

So I've been slowly getting my endurance, pace and distance back up after delivering twins/being on bed rest since December (not having ran since sometime early spring last year). Anyways, progress is slow but I'm being patient. My deal is my knees. I've never had a problem with them hurting all day and not during a run. When I run, they are fine, it's just getting up from a sitting position when I feel like they might give out. I figure ill have to incorporate glucosamine supps? There are SO many out there that I have no idea where to begin. Any runners out there have any recommendations?
<bot>: I'm getting old/post pregnancy and now my knees are suffering. What is the best glucosamine (or alternative) for preventative joint pain other than NSAIDS?