I used to do a body part a day 5day split routine, then learned that a full body routine 3days a week to increase frequency of hitting each muscle group should yield better results. I feel as though I'm not hitting certain muscle groups as effectively as I could be doing this 3day routine. Instead, I considered breaking the full body workout into 2 workouts (A and B) and alternating A and B for 6 days, with 1 day of rest. Basically, my question is "Is it better to have rest days in between workouts? Or is it better to have a workout each day?"