Watching the clock go ticktock on a 20-minute treadmill jog can feel like a marathon. Instead, try a countdown. Set a kitchen timer with the minutes you’re aiming to be active and go until you hear the alarm. When you can’t see the time, you’re more likely to concentrate on what you’re doing right now–your form, how strong you feel–rather than how long until you can stop. Plus, you’ll avoid the urge to let up on the intensity when you have only a minute or two left.