Here is another exercise equipment that turns any doorway into a gym for all kinds of workouts. The Doorway Fitness Tower (DFT 250) lets you perform pull-ups, push-ups, stretches, core, and lower body moves. The back support protects your lower back and prevents you from swinging back and forth.
The Doorway Fitness Tower 250 can be used to target your back, shoulders, abs, chest, triceps, obliques, and legs. You can get it for under $80 at this time.