If the question is looking for multi-functionality and results from workout equipment, the answer is the Vertical Knee Raise/Dip unit. Combining the efficiency and effectiveness of push-ups, sit-ups, crunches, bench-presses and other exercises, the Vertical Knee Raise/Dip targets two distinct muscle groups. The vertical knee raise works the hip flexors and the rectus abdominus, the main abdominal muscles that create "six pack" abs. The rectus abdominus is a vital muscle as it runs through the torso, extending from the sternum down to the hips. When people speak of strengthening their core, they are referring to the rectus abdominus. Dips are one of the most effective upper body exercises because they are a compound movement, meaning they require the use of multiple joints simultaneously while also forcing the body to stabilize. As an exercise that targets the chest, triceps and anterior deltoids (fronts of shoulders), dips have numerous benefits in terms of strength improvement, mass building and general fitness. They are more effective at building the chest and triceps than bench presses and push-ups because during a dip, all of the body weight is supported with the arms, not just a portion. The core also comes into play during dips to help the body stabilize and keep from swinging. It's recommended that both exercises be done slowly, so that muscles do the hard work and not momentum from leg swinging. Built for comfort along with effectiveness, the Vertical Knee Dip/Raise features a well-cushioned back pad, inward angled arm pads and properly angled grips for both dips and knee raises. Please note this is the Vertical Knee Raise/Dip only. Weight bars, weight plates, dumbbells and all other accessories are available separately. To increase difficulty and effectiveness, hold a weight between the knees or wear ankle cuff weights while exercising. While assembly is required for the Vertical Knee Raise/Dip, no power tools are needed to put this unit together. Because no spotter is needed for knee raises or dips, this is an ideal versatile and multifunctional unit for home workouts. The convenient footprint of 28" x 42" means the Hyper Back Extension can fit nearly anywhere. Easy to clean needing just a warm, damp cloth and some mild soap.