Sandy Sklar, an NASM-certified trainer, corrective exercise specialist, certified pre/post-natal trainer, and owner of Prescriptive Fitness, likes the ROSRAN Pull-Up Bar ($50), because it's good for more than just pull-ups. "Even if you can't do pull-ups, this bar is superversatile and can be used for push-ups, sit-ups, and [resistance] band attachment use in the doorway," Sklar told POPSUGAR. Attaching resistance bands to the bar gives you the ability to do several different exercises, like rows and tricep press-downs.