Another cool article via GoArticles (I wish they didn’t make getting to their articles such a pain in the ass) regarding how to increase strength without spending hours at the gym.
Some body builders lift weights for more than six hours a day, but you don’t have to waste that much time to become very strong. Training for weight lifting is done in sets. A set of ten means that you lift and lower a heavy weight ten times continuously before you rest. If you repeat these sets of ten three times with a rest period between each set, you have done three sets of ten.
Pick 6 to 10 weight-machine exercises and do them in three sessions a week. In each exercise, try to lift the heaviest weight that you can lift comfortably ten times in a row without hurting yourself. When an exercise becomes easy, increase the weight. In five months, you should be able to increase your strength significantly and be proud of your larger muscles.
I hope this is correct, because it is basically what I am doing. Though I do 15 reps, not 10. I haven’t noticed an increase in strength yet, but really, how would one notice that?