Great thread, good advice all around.
I do my gym workout (weights and jogging or stationary bike) in the evening, right after work. I eat dinner immediately afterwards, making sure to get some protein in my system within an hour after the workout. I, personally, can NOT eat BEFORE the workout. When I do I feel bloated and sluggish. It gives me a clear head too, and as I hit the gym after work, all of the stress and frustration that I have accumulated from a challenging day of business just seems to melt away after an aggressive session with the weights.
I do exercise in the mornings as well, I swim 2 or 3 days a week. I'm no good in the weight room early in the am, I just feel like I don't have my strength... but a good 1000 yards in the pool feels great! Luckily there is an indoor city pool within walking distance from my house, and the sides of the building have big panoramic windows so I can enjoy the sunrise! Let me tell you, of ALL the athletes' "highs" that one can feel, there are none better than what you feel after a great swim. It just puts me into an amazing mood. I basically do a warm up of 200 yards, then 10 x 50 timed sprints (fast interval training), then a quick break for cardio recovery, then I swim an aggressive 100 free, then 100 yds of an alternate stroke, and finish with an all-out timed 100 free. It takes me about 20-30 mins to do this.
As for the gym, I try to go 4-5 times a week, but keep the workout SHORT. Basically, 30 mins of weights (an INTENSE 30 mins, not counting any "socializing"), and 30 mins of cardio, then I'm out. Keeping my workouts short make them less of a major production requiring fitting into a busy schedule. I keep a 3-stage split of muscle groups I work on, and I mix the split from time to time to prevent muscle memory issues. Right now, my split is a day of shoulders, back and triceps; a day of chest, abs, and biceps; and the final day on legs and whatever body part feels weak, or was not covered well on either of the previous two days. I know, it's kind of an unconventional split, but I like to mix things up.
I LOVE the Glutamine recommendation, amen to that. In addition to my normal vitamins, Glutamine is one of the items I supplement with as well, and the Omega 3's (fish oil) and I'd recommend adding in Acetyl L-Carnitine, Borage Oil (Omega 6 and 9), and CoQ10 as well.
When I don't work out, stress starts to get to me. I can literally FEEL the difference a workout makes throughout the day, in improvement in energy level, mood, general feeling of well-being, and quality of sleep. When I've been good with my workouts, I sleep very deeply and restfully, and wake up completely refreshed.