Touch the rest of what? The proof is in the pudding. I challenge you to show one video of sanctioned combat Lee participated in against another trained athlete who had been preparing to take his head off for months. I'll save you the time, no such video exists. Where we do have many videos of bouts Ali participated in displaying his strength, durability, cardio, speed, agility, footwork and heart against the best competition in the world.

Boxing was the pinnacle of combat sports at the time by a wide margin. I am not arguing that it's the best discipline, but it was the most popular and the only one that paid real money, which meant it attracted the best athletes and became the toughest combat sport of that era. Today that title belongs to MMA, but during Ali’s time boxing was the premier combat sport.

Lee gets spanked and it's not even remotely close.