Your goal in the gym should be to train with the minimum amount of volume needed to yield an adaptive response, and not a thing more.
Once you have pushed your muscles beyond their present capacity and have triggered your inner "alarm system", you have done your job. Any further stress to the body will simply increase your recovery time.
Most people train way too often and with far more sets than they really need to. High intensity weight training is much more stressful to the body than most people think. The majority of people structure their workout programs in a manner that actually hinders their gains and prevents them from making the progress that they deserve.
Here are 3 basic guidelines that you should follow if you want to achieve maximum gains:
1) Train no more than 3 days per week.
2) Do not let your workouts last for longer then 1 hour.
3) Perform anywhere from about 4-8 sets for large muscle groups (chest, back, thighs) and 3-4 sets for smaller muscle groups (shoulders, biceps, triceps, calves, abs).
If you truly train hard and are consistent, training more often or any longer than this will be counterproductive to your gains.
It really is surprising just how misguided the majority of the population is in the gym.
Donald
Muscle Building Program | Bodybuilding | Gain Muscle Mass