I've been doing Stronglifts 5x5 for about 5 months now and I've seen good results. I've put on about 45 pounds (155 to 200) and I've made pretty good progress on my lifts.
However, I'm getting a bit bored of the routine and I'm looking to switch things up. My main goal is to add size and muscle mass, and I've heard one of the best routines for this is a 4 day split - something like legs/chest/back/arms on the schedule ABxCDxx.
What do you think about this? Also, do you recommend any routines?
Many thanks in advance, I would be happy to supply more info.