Strength training is the most productive form of exercise.There are some basic principles that must be followed if you want to enjoy the which strength training has to offer. Progressive overload simply means that you must force your muscles to work harder each time. That means you can''t use the same weight every workout regardless of how many sets or reps you do. The best way to do this is by attempting to increase the resistance/weight used and/or increase the number of repetitions performed at each workout. The speed of the movement is also an important element of each exercise. A reasonable training pace is one to two seconds for the lifting (concentric) portion of the exercise and three to four seconds for the lowering (eccentric) portion of the move.