1.     Strict Reps:  Use slow, strict reps in both the  lifting and lowering of the weights.   When you’re moving too
fast through the exercise, swinging (very little  of your own muscle strength)  is doing all the work.  In this case
you’re really not working the intended  muscle.  Each rep should be performed in a slow, controlled fashion
throughout  the  entire range of motion.  

2.   Lock out:   Too many weight  lifters like to use partial reps and limited range of motion
 lifts into their  routines.  The problem with using  the partial rep  technique is that a lot of the muscle
 goes un-worked. To get the maximum work  from  every rep, lock out each time, but without resting between each rep.
Locking out at each rep allows more muscles fibers to be activated.  With  locking out, you also get the  benefit of working the stabilizer  muscles.

3.   Opposing muscles:  Bring  your  opposing muscles into play.  You  should always strive to make the
exercise harder by flexing or pulling with the  antagonistic muscle group during  lowering or negative phase of the  exercise.  Again, more muscle  fibers  will be stimulated for greater  growth.

4. Concentrate:  You  must learn to put mental effort  into every rep of every set.  The  more  concentrated
 your effort, the greater the muscle is worked.  If you want to  reach your goals, you’ll have to physically push yourself  to the limit.  Wandering thoughts  and idle chatter while training are detrimental to success.   Concentrate on the task at hand!