Lie down on the mat with your knees bent and place your feet under the couch. [substeps] Alternatively, you can have a friend hold your feet down for you instead of the couch.
[header] How to do russian twists [title] Place a mat or towel on the floor. [step] Place the mat near a couch or another piece of furniture that has a small, but big enough, space to stick your feet under. The resistance from the couch will stabilize your body while you do the twists.