"Let's do some back exercises," female bodybuilder Nathalie Falk says, as she does one-armed rows and barbell presses in the gym, and posing in tiny panties to show you how powerful the muscles of her back, pecs, biceps, abs, glutes and legs are.

"Let's do some back exercises," female bodybuilder Nathalie Falk says, as she does one-armed rows and barbell presses in the gym, and posing in tiny panties to show you how powerful the muscles of her back, pecs, biceps, abs, glutes and legs are.