Healthy Labrador Retrievers are high energy/drive dogs. High energy dogs have active minds and they require mental stimulation as much if not more than physical. So you need to put that brain to work.
This will help you to regulate your dogs behaviour. Mental stimulation is essential for a high drive labrador in that it can ‘cap’ that energy. You will teach your energetic puppy to go from an active state to a ‘capped state’. And mental stimulation can raise the energy of a low drive dog.
Mental stimulation is just as tiring for a dog as physical. However, to get a good outcome, this will require you to be just as engaged as your puppy. Be consistent!
The emotional and psychological development of puppy is equally important as physical.
I highly recommend that you construct your training program around feeding times. A labrador puppy will need to eat 3 times a day.
Start with 3 minutes of training before each feed, 9 minutes each day. When you reduce to 2 feeds, train twice for 5minutes. And when you reduce to 1 feed, train for 10 minutes, each day.