How to Build a Home Gym in 900 Square Feet (or Less)

Mario Tarabbia visits the gym about six times a week. But he doesn’t have to go far.When he moved to his 900-square-foot, one-bedroom rental apartment in Williamsburg, Brooklyn, he embarked on an ambitious renovation project.On walls beside his dining room table, Mr. Tarabbia mounted a roughly nine-foot-tall squat rack and a weight tree to hold