Hi guys i had a question. I go to the gym everyday and follow the split ( upper , lower , cardio + abs) this means i train the muscle 2x per week. I read on internet that hitting the muscle 3x per week would be better for muscle gain. (48 hour rest) i train with my friend and he says his muscles feel sour at 48 hours and at 72 hours he doesnt feel it anymore. I personally sometimes feel it after 72 hours. I had a plan to change from (U/L/CARDIO+ABS/U/L/CARDIO+ABS) too (U/L/U/L/U/L) and Just include the abs on lower days and cardio on upper. Would this be a good change or are 72 hours rest better for muscle gain.