Old Age

So, one thing I've noticed increasingly in my increasing old age is that joints simply hurt. I've been doing some aerobics for cardio and every time, my lower back suffers. It's feels like a grinding pain that goes away by the end of the day, but it bothers me enough to be worried. Same thing goes for my knees (though not from cardio... just in general).

As a result, I picked up a big thing of "joint juice" from Costco (you know, one of those glucosamine supplements). Not sure if it works, but figured it'd be worth a shot. Anyone have any knowledge/experience with that stuff? I know we gave my dog glucosamine shots for her bad hips and it worked wonders...