As effective as free pull-ups are, unfortunately, they are among the most challenging exercises in the entire fitness world. Fortunately, there is a great aid that is especially helpful for beginners: ...

Last week, Brigette Williams talked through the basics of building strength to do a pull-up. She says once you have mastered the TRX and assisted pull-up, you can move to a bar or pull-up machine.

"Be able to do a pull-up" is a common fitness goal, and if you work hard—with negative pull-ups, inverted rows, and more—someday you'll get there. Go ahead, take a minute to celebrate. But don't drop ...

Air Force Senior Airman Brandon Stout, 380th Expeditionary Civil Engineer Squadron, does pull-ups during a workout at an undisclosed location in Southwest Asia on Sept. 11, 2013. (Staff Sgt. Joshua J.