Exercise technique marketed by Charles Atlas
Ltd. from 1926 to today.
The technique uses no weights or special apparatus, but basically involves pulling on your own body parts (or just flexing) to gain "he-man muscles."
You may have seen the oft-satirised comic book ads that promise to turn a 97 pound weakling into a hulking giant. Also helps you avoid getting sand kicked in your face and score babes.
Charles Atlas's dynamic tension technique turned fitness into an industry. We have him to thank for endless infomercials and abulation devices that take up space in attics and basements everywhere.