Yep, frequency is the key for sure. Most people think doing a body part every day is too much, when its actually not. It has been proven by Dr. Jacob Wilson that training a body part 5 times a week, 4 sets per day, has 40% better results than just doing 20 sets once a week. If you are doing 12-15 sets per day for the same body part, then for sure that is too much, you need to recover. If you stimulate the muscle once a day, you can recover easily before the next workout. Depending on your age, protein synthesis can only last 4-8 hours instead of 48 hrs when you are younger... Nice post, keep it up! @muscleroast.com