It is amazing how many people go to the gym and perform the same workout from one session to the next. Day after day, month after month, year after year, their routines don't change. When training becomes mundane, apathy is bound to set in. Ultimately, motivation wanes and a plateau is sure to follow. The best way to avoid complacency is by constantly varying your exercise regimen.
Variety is the spice of training.
Not only does it help to keep your workouts fresh, but it also fosters more complete development of your physique. You see, the human body is a very resourceful entity and readily adapts to a repetitive stress. When the same stimulus is applied on a regular basis, the body doesn't respond as well to the stimulus. Only by keeping your body off guard will you continue to reap muscular rewards. One way to vary your routine is by utilizing a wide array of exercises.