Everyone needs to change their training around, everyone gets sick of doing the same old stuff after awhile. So if you pull conventional all of the time, go with sumo deads for a little bit. Put your ego in your pocket and drop your max down. Tired of benching? Heavy inclines are a great change. And you know what else? You may discover that you have some weak points that changing things up bring out.Then you can focus on those and when you switch back, you are stronger than ever.Plus, man, stuff just gets old and BORING after awhile. Everybody needs it- in work, in training, in life-Variety is the spice of life.
Also- Sometimes changing things around gives you the shot of motivation that you were looking to find.