Press the Sleep/Wake button to silence the ringer. To send the call directly to voicemail, tap Decline or hold the mic button for about two seconds.
If you choose to answer the call, your workout will be paused during the call. When the call completes, press Play to continue the workout.
Note: If you place a call during a workout, your workout will also be paused during the call. When the call completes, touch the red bar at the top of the screen to return to your workout and then press Play to continue the workout.