30 to 40 minutes a day, 7 days a week.<p>4 days a week: cardio.
3 days a week: weights.<p>For cardio, it's most often the stationary bike in my condo gym. I pedal as fast as I can get to 1,000 calories (about 32 minutes). I sometimes go for a 10k run instead, if it's nice outside (about 45 minutes). In the summer, soccer with my work team replaces cardio once a week.<p>For weights, I run through a circuit of exercises in about 35 minutes. On a universal gym: seated bench press, quadricep extensions, hamstring curls, tricep extensions, lat bar pulldowns. With free weights: back flys, shoulder lifts. On a mat: various situps. To finish off: 2 minutes of very high-intensity cardio on a stairclimber.<p>Weekdays, I do my workouts right after work, before dinner. I don't think I've missed a workout for about four years, except when traveling. (When traveling, I do a 25-minute body-weight "core circuit" of situps and pushups in the morning immediately after getting up.) Weekends, I get the workout (usually the cardio) out of the way as soon as practical...usually after getting laundry or some other task started.<p>If doing this every day without fail seems rigid and bordering on obsessive, it's because I've learned for my own personality type, it's vital to make it part of my daily routine. The less I have to think about it, the more likely is that I'll stick with it and make no excuses. There's now never any question as to whether I will or won't exercise on any given day - it's as routine as eating dinner.