It has action on every play, then calm between plays as each team decides what to do next.
Some football players are big and powerful, but others are small and fast.
Brute strength is often required, but so is intelligence, agility, and skill. It can be a game of great complexity, especially at the professional level, yet the basics are easy to understand no matter who is playing. One 11-man team has possession of the football. It tries to stop the offensive team and make it give up possession of the ball. And so on, back and forth, until all four quarters of the game have been played.