My current routine is working pretty well for me. First, 10 minutes of cardio and 5 minutes of stretching. Starting with squats. After 3 warm up sets, I hit a work set of 5 with 10 pounds more than I did the previous week. Then I hit a set of 20 with a weight I can normally get for 10. After a good five minute rest, I move to close-stance smith squats where I do 5/5/8 reps. Using a weight I can get for 6, I do 5 reps, then I add 10 and go for 5 again, then I go back to my first weight and hit it for 8, or as many as I can get, using any techniques possible to get to 8 (rest/pause, forced reps, etc...). From here I take it to leg curls, where I go 5/5/8, then calf raises, where I do 8/8/10. Stretch for 10 minutes, done.