I went for a walk instead of doing c25k. I don't want to risk hurting my knee more than it already is. :\ I will keep what you say in mind, though!

30DS is intense, but it's a great workout. I am thinking that maybe the jumping around in level 2 is what is causing my knee to hurt, though. not sure.

pushups: just jump right into the program! it's all explained on the site and it's really simple. :)