He's correct about this taking 90 minutes. That's 20 minutes warming up on any of the treadmills, 10 minutes stretching, 10 minutes per machine (3-5 seconds per rep, 8-12 reps, 4 sets including a warmup set, a minute between each set, and a minute or two between each exercise to setup the machine, wait for somebody to finish up, etc.), and about 4-5 exercises. So, 20+10+50+10 minutes to change = 90.<p>I disagree on the frequency. I think coming into the gym to do a routine 4x a week is about perfect, and 2x more times a week just to jog for 20 minutes and that's all (to keep the habit up.) And if one is too sore and tired to put in full effort on one of the 90 minute days, then just jog for 20 minutes (again, just to keep the habit up) and resume the next day.