I admire the way Debbie Reynolds devoted herself to dance for Singing in the Rain. Of course, being a perfectionist, Gene Kelly wouldn’t have had a partner who worked any other way. They practiced the routines until they could be performed with ease and grace, despite anything. Her feet were bleeding by the time they finished filming Good Morning, but she continued.
An aside: Kelly had a 103 degree fever on the day they were meant to shoot the famous title sequence. He performed anyway.