Mittleman set three consecutive American 100-Mile Road Race records in the US National Championships 1980–1982. His fastest 100-Mile Run was 12 hours 56 min. In 1986, he won the 1,000 Mile World Championship and set a new world record by running the distance (1 609.344 kilometers) in 11-day, 2 hours 6 min. 6 sec. Mittleman set three consecutive American Records in the 6 Day Race, the final one being set in 1985 at the University of Colorado Field House. One record, which still stands: 577.75 miles in 4 Days.
In December 2008, Mittleman became the sixth American – the third American male – to be inducted into the American Ultrarunning Hall of Fame.
- WorldUltrafit Company of Mittleman, based in California.
- Basics of Stu's Approach Tony Robbins refers to the "Stu Mittleman method" in the "Ten Day Challenge – Aerobic Power".
- Slow Burn. Slow Down, Burn Fat, and Unlock the Energy Within (ISBN 0-06-273674-4) Book, written by Mittleman.
- American Ultrarunning Hall of Fame
- Stu Mittleman inducted into the American Ultrarunning Hall of Fame
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