Home gym units are back in a big, big way. They all, however, have one annoying trait in common. They take up so much room! Who wants to dedicate an entire room of their house just to staying fit? Now you don’t have to .The 4 Fitness compact gym, shown above, squeezes in just about anywhere. It’s skinny and folds up to give you that “out of sight out of mind” feeling we all long for. This all-in-one gym unit integrates fitness equipment to train in four areas(endurance, strength, agility and mental fitness). The 4 Fitness was designed by a team of doctors and fitness trainers who apparantly all have small homes. The unit is only a concept for now but expect it to go on sale shortly.