Consider buying door anchors for a quick indoor workout. For more advanced exercises you'll need a horizontal bar or beam to fling the straps over. If you don't have one at home, head down to your nearest playground or outdoor gym and look for parallel bars, a set of monkey bars or even a swing frame work well too. You can even hang from solid tree branches if you live in a leafy area. Just make sure you give the rings a good tug before use to check the beam will hold your weight.