I've noticed that I'll often be stronger too after a week or so off.
Could this be from glycogen buildup, however? If the body burns glycogen for fuel during these workouts, is it possible that working out more often leads to lower average glycogen levels (especially if you're following a relative complex-low-carb system as MANS and GLAD advocate). By taking a break, is your body is slowly restoring these glycogen levels, leading to increased available energy during workouts?
If you're taking creatine, it could also be because more creatine is able to saturate the muscles during the days off, without being depleted by the workouts. This results in a higher level of muscle creatine = those extra 1 or two reps.



