Marilyn loved to work out. She was ahead of her time, to make her own working out program. Here, LIFE photographer Philippe Halsman captured a few candid shots of her daily workout routine at the Beverly Carlton Hotel in January, 1952.
The photographer recalled “...On the ground, there were two dumbbells I asked her if she was using it, she replied ‘Yes’ she answered me, ‘I'm fighting against gravity.’”