For example, bringing your leg up high and holding it there with your hand. The split is also an example of passive stretch where the apparatus that you use to maintain your position is the floor. Slow relaxed stretching is useful in relieving spasms in muscles that are healing after an injury. Note this when you are speaking to trainers or reading articles on the subject. It is one of the fastest ways to develop static-passive flexibility and is more effective than either passive or active stretching alone.
Most people use their own bodies for the resistance.
For example you might hold a ball on your foot and keep your foot from flexing while you use your calf muscles and strengthen your instep. You might also use a partner, an example of which might be to have them hold your leg up high while you attempt to force your leg back to the ground. It combines passive stretching and isometric stretching in order to achieve maximum static flexibility. It was developed to rehabilitate stroke victims. When using stretching to warm up for other exercise you will be using static and dynamic stretching, You will need joint rotations and some light aerobic activity.