Jumping rope is something I do almost everyday. After injuries to both knees, I skip instead of run (occassionally I will run some hills or find a grassy area to jog). I will skip in rounds or keep moving for 15 to 20 minutes at a time. I mix it in, double unders, squat jumps, high knees, etc. and move around the gym (adding some footwork in). Here's a great clip of JT Van getting down with the rope showing how boxers use them.
World Champion Richard Trammell shares his experiences, views and thoughts on fitness, martial arts and fighting.