Everybody at some point during their strength training regimen will hit a plateau. During this time your strength gains are minimal and you are simply maintaining what you have built. This can be very unmotivating since you continue to work hard without further gains. Luckily, with the right plan in place, this can be easily rectified. By making certain changes to your workout routine you can maintain improvements on a regular basis and continue to see progress.
The first thing you can do is change up your exercises. Over time your body will start to adapt to these specific movements. In order to continue to see improvements, you have to modify the exercises to stay in a constant state of change.