Leg day today and my knee is bothering me

I'm working out on legs today and my knee is bothering me. Perfect time to let people know what to do if you have pain. The first sign of joint pain is the first sign of nipping it in the bud. First: if  it hurts when you work out then don't work out on it that week. Second: ice it, it my take some time to find the source of the pain but try and apply ice to it.You will know when you found the source when the pain feels temporarily numb. Place the ice in a plastic bag and put it directly on the injured spot for about twenty minutes. Most people get lazy (me included) and use the cooler packs. They don't get cold enough and don't work as well so stick with the pure ice.Third: if you can stretch it out. Do light knee bends and hold for five seconds rest for twenty seconds then bend for another five seconds. Do this a few times then rest. I hope this helped anyone that has or had this problem.