Kraenzlein was born in
Minneapolis,
Minnesota, a son of Johann Georg Kränzlein, a brewer, and Maria Augusta Schmidt, both of German origin. After his family moved to
Milwaukee,
Wisconsin, he attended Milwaukee's
East Side High School, where he became involved in sports. In 1895, during the
Wisconsin Interscholastic Championships, he won first places in the 100-yard dash, 120-yard high hurdles, 220-yard low hurdles, high jump, and shot put. He attended the
University of Wisconsin where he studied engineering. In 1896, he won the 220-yard low hurdles, the high jump and placed second in the 100-yard dash and shot put at the freshman-sophomore track-and-field meet. During the 1897 Intercollegiate Athletic Conference Championship, Kraenzlein won the 220-yard low hurdles and the high jump. He led the
Wisconsin team to the team title. He also won the 1897
Amateur Athletic Union (AAU) title in the 220-yard low hurdles. In 1897, Kraenzlein set an indoor world record of 36.6 seconds in the 300-yard low hurdles. In 1899, Kraenzlein established the long jump world record of 24' 3 1/2". He was a leader of the Penn track-and-field team that won four consecutive team
IC4A titles. Kraenzlein was noted for his hurdling technique, as he was among the first to practice the modern method of straight-lead-leg (the first leg over the hurdle remains straight and parallel with the ground) hurdle clearing.
Arthur Croome from Great Britain first attempted the straight-lead-leg style in 1886, however, Kraenzlein perfected it and turned into a mainstream technique. This was a significant development, as it enabled athletes to overcome the hurdles without reducing speed. ==The world's spotlight==