For those interested in creating a home gym or taking exercises on the road, exercise cords are a good, lightweight alternative to dumbbells. These kits often come with an anchor which allows you to attach it in a doorway for lateral or overhead exercises.
For those who travel often and find it difficult to maintain a consistent exercise program, these might be the perfect solution. They pack lightly but can give a legitimate workout when filled with water.
Hammachler Schlemmer carries a foldaway stationary bike which is perfect for those with limited space in their apartments. Patients report it is sturdy and stows away easily in a closet.