Therefore, five or 10 minutes of an aerobic exercise is wise. You may want to hop on an exercise bike, jump rope, walk or jog before you begin your weight-training session. Trying to lift weights that are too heavy can strain or tear muscles and put you out of action. Increase weights gradually when you can go through three sets of eight to 12 repetitions easily. If you want to build muscle more quickly, you can use weights that fatigue a muscle group in 12 repetitions, but make sure to use proper form.
Form is everything when it comes to weight training.
It's important to know which muscle group you're working when doing an exercise. Concentrate on isolating the muscle group and moving the weight slowly through a full range of motion. Don't forget to breathe, exhaling on the exertion. You may want to consult a fitness trainer to help you get started. Inattention while working out may result in injury, or at least an ineffective exercise session.