I've been going to the gym about 4 times a week, splitting my workout between cardio and strength training. In order to properly maintain my heart rate for my cardio plan, I have to do that before the strength training. It's not too strenuous, but I do my cardio work 4 times a week and my strength training 3 times a week. Necessarily, one of my cardio days is right after my strength day, and then a day off from both after that. I just started the Strong Lifts 5x5 program, so the weight isn't anything special just yet.
One of the areas I'm deficient in is flexibility. I'm working on that, but due to the amount I use my legs, they seem to stay stiff. In particular, I feel my quadriceps pulling on me for the first minute when I get up and start walking around. They are also an area I don't stretch enough.
I'm interested in more than just stretching the quadriceps, so please provide some insights, tips, stretches, etc. that will help with my leg flexibility. I'd like walking to not feel like my legs are working against me.
Feel free to post multiple stretches in your answers. Extra kudos if you can come up with a complete routine.