how often should you change excercises?

After getting into a rut on the flat bench, I started a new routine (one of Waterbury's full-body routines). I decided to use the incline bench for my chest work and after four weeks, I made some decent gains. Just for kicks, I decided to go back to the flat bench for my first workout of this week (week 5) and much to my surprise, I made much better gains on the flat bench than expected.

Before I started the Waterbury routine, I could barely flat bench 160 lbs. 4x5 times, but yesterday (after doing incline for four weeks) I was able to do 170 4x5 w/ little struggle. My chest is pretty sore today which I wasn't really surprised about.
So my my question is, is it too early for me to go back to flat bench?
Should I stay w/ incline for a few more weeks or switch to dumbells?
 
IMO incline is obviously kicking your arse, so stick with it and ride the sucker dry. Then switch.
 
I usually switch things up every six to eight weeks. That's usually about the time I get tired of doing the same workouts. I'd probably give a routine longer than four weeks, but that's just me. If you're happy with the results after switching every 4 weeks, then stick with doing that.
 
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