18 Start Your Stopwatch
Use 3D Touch on the Clock app icon and you’ll see three options: Create alarm, start stopwatch, and start timer. They’re pretty straight forward, but they save you a couple of steps. If you want to start your stopwatch quickly this is a great way to do it as it starts instantly.
Once the stopwatch or timer is started you can 3D Touch the icon again and select stop. When you start a timer it automatically starts counting down with the most recently used amount of time. Create an alarm jumps right into it, allowing you to quickly title and setup your alarm.