Giggle Pie on Instagram: "By the time Mike Tyson was just 18 years old, he had already built a physique that looked more like a heavyweight veteran than a teenager. One of his most iconic features was his 20-inch neck — the result of brutal, old-school training methods designed to absorb the kind of punches that would knock most fighters out cold. This particular exercise, known as the “neck bridge,” was a cornerstone of his routine. Tyson would lie on his back or stomach and support the entire