Timing is everything when you are working out. You need to keep track of how long you are working out to make sure you are hitting your weekly goals. Then you need to keep track of how long each movement is taking you so you can measure your intensity and ensure you are hitting your target heart rate. The faster you go, the more intense your workout will be. You also need to keep an eye on the clock to give yourself sufficient rest between sets -- though not too much rest. The wall timers from X Training Equipment ensure that you always know exactly how much time you are taking to perform each set and each routine. You can even program the timers for intervals and other workout goals. They mount on the wall for a convenient display, and you can use a remote control to operate them.