Your weight training workouts should not last more than one hour. The optimal workout duration is probably even shorter; around 45 minutes. Overly long workouts exhaust your nervous and endocrine system, decrease your levels of growth hormone and testosterone (anabolic hormones) and increase your level of cortisol (a catabolic hormone that breaks down muscle). If your workouts exceed 60 minutes, you should change your split routine, decrease your volume (number of sets, number of exercises) or decrease your rest intervals between sets. Most people can get excellent results with as little as 3045 minutes of weight training per session. If you add 30 minutes of cardio at the end, your total workout time for the session is 60 to 75 minutes.
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