His playing weight never exceeded 210 pounds.
He also played a key role in the finest pitched game in history: 7/2/1963, the epic duel between Juan Marichal and Warren Spahn. Willie hit the home run that won it for the Giants in the bottom of the 16th inning, 1-0. Both pitchers pitched complete games.
I went to a game in Houston the year the Astrodome opened (1965). The high flying Giants pummeled the lowly Astros 10-1 that day, with Juan Marichal on the mound. The highlight of the day was seeing Willie Mays hit a monster home run to dead center field, which very few accomplished in the old Astrodome, where majestic, well hit fly balls mostly died on the warning track.