Alumni Gymnasium was designed by Charles Rich and Fredrick Mathesius.
In 1938, engineers from the Thayer School of Engineering constructed a springy board track of Canadian spruce around the inside of the gym which was used by Glenn Cunningham to break the American mile record that year.
In 1962–1963, the gym was extensively remodeled to include a new basketball court and added to the Dartmouth College aquatic facilities with the addition of the Karl B. Michael Pool.
In 1972, the year the college went coed, a two-story women's locker room was added to the southeast corner.
As part of the renovation efforts, Alumni Gym now features a 14,000-square-foot (1,300 m2) fitness center built into the second floor, 8 new multi-purpose fitness rooms that together add roughly 10,000 square feet (930 m2) of new usable space, structural enhancements to the Karl Michael Pool, new entrances, an elevator servicing all floors of the gym, and handicap accessible upgrades.