Welcome to Body Balance, a class at UT Health’s Olympic Center gym designed to improve balance and prevent falls. Mahaffey, 28, leads the half-hour class at 9:30 a.m. each Tuesday and Thursday.

As Elvis Presley crooned “All Shook Up,” class members struggled to balance on one foot while lifting the other one off the floor. “There’s a whole lot of shaking going on right here,” said instructor ...