Update!
Week II: I'm lifting heavier, but not quite pushing it to muscle failure, yet. That'll come next week. Right now, every major muscle group is pretty darned sore. I'm running every evening, then lifting. I'm eating six times a day, primarily protein, avoiding sugar, soft drinks, and white flour, drinking lots of water, and getting 7-8 hours of sleep every night.
I have three workouts that I rotate through:
Workout I: Squats, hamstring curls, calf-raises, preacher curls, forearm curls.
Workout II: Flat bench press, inclined bench press, shoulder press, side laterals, abdominal crunches.
Workout III: Lat pulldowns, tricep pushdowns, seated row, deadlift, shrugs.
Rotating through this from Monday through Friday, it keeps any one muscle group from getting overtrained, and yet, it's a full-body workout. Each exercise is done in three sets, usually from a wide stance/grip, then medium on the second set, and then a narrow stance/grip on the last, hitting each muscle from different angles.
It's brutal, but very effective.