At the same time
Definition 1 of 2
Pro Tip 1/3Multitasking
Used when someone is doing multiple things at once, which can be challenging. 
He was answering emails and listening to the webinar at the same time.
Pro Tip 2/3Simultaneous Actions
Describes two or more events occurring in a synchronized manner. 
The dancers jumped and landed at the same time.
Pro Tip 3/3Coordination
Highlights the coordination or synchronization required among participants. 
Let's start the race at the same time to ensure fairness.