The best and most effective way to start a resistance training routine is by doing a full body
workout 2 to 3 days per week. In this
workout, you should be doing one exercise for each major muscle group. You want to do 1 to 3 sets of each exercise (max), and do 15 to 20 repititions per set. By the last rep, you should reach momentary muscle failure (you should be unable to complete the last rep, or it should be almost impossible). This is how you will choose your weight for each exercise.