How do I Pause/Stop Bumps from playing during a workout?

You can pause/stop Bumps from playing while you're in a workout by opening up the Control Panel.  Tap on the up arrow "^" at the bottom of the workout screen.   Once in the Control Panel, tap on the "Receive bumps during session" switch.  You can also turn the switch on if you would like to listen to all of the Bumps you received while it was paused.