On a standard 400m lap track, it takes four laps to get to a full mile. If the NFL regular season a four-lap track session, then we’ve hit the quarter mark (yes, it is 17 games, and yeah, four doesn’t fit into 17 perfectly, but not we’re not here to debate the concept of prime numbers/etc...ya want that, get back to your grade-school math books). To make it, it is a balance of intensity and endurance. How often have some started out so strong, but then fell off just as fast at the end? Still, a good start is important to run an effective race/navigate a NFL season.