1. Walter played American football, which is distinct from soccer (called "football" in most of the world), as it involves more physical contact and specific equipment like helmets and pads.
2. Full-contact football requires extensive protective gear including a helmet with faceguard, shoulder pads, hip/back/rib/thigh pads, cleats, gloves, a mouth guard, a chinstrap, and optionally elbow pads.
3. A standard football game consists of 4 quarters, each lasting 15 minutes, for a total of 60 minutes of actual play time, though the game can take much longer due to frequent clock stoppages.
4. The field is 100 yards long with 10-yard end zones on each side, making the total length 120 yards; scoring occurs via touchdowns (6 points), extra points (1 or 2 points), field goals (3 points), or safeties (2 points).
5. Each team has 11 players on the field at any given time, divided into offensive, defensive, and special teams units, with specialized roles such as quarterback, running back, receiver, and kicker.
6. The offense aims to move the ball 10 yards in 4 tries (downs); if successful, they earn 4 more downs; if not, possession turns over to the opposing team.
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